Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ab60a50a7a5e2f…

MALICIOUS

PDF

91.6 KB Created: 2021-03-30 08:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 824402a3e9b1e1161a4d3eb4448af9a0 SHA-1: 17c16037a993c0a01819d672a4af0ff306e0b767 SHA-256: c9ab60a50a7a5e2fd3de7164a911c84e309abb9ae19ee6b9af29692079e4b7ad
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/123?utm_term=view+orientation+and+anatomical+planes+worksheet PDF link annotation
    • https://cdn.sqhk.co/woguwubege/Uhiiagh/crash_tag_team_racing_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/jVhhhjI/gigedalapisipu.pdfIn PDF document text
    • https://cdn.sqhk.co/liwewajawab/jcicF6a/15698793594.pdfIn PDF document text
    • http://wizuvadidena.iblogger.org/tuberculosis_treatment.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/mN1tigC/crs_user_guide_version_2._0.pdfIn PDF document text
    • https://cdn.sqhk.co/xinovupu/Ut8hfhh/snake_worm_zone_2_io_2020_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vofepubot/lgihdAT/auto_views_instagram_free_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/Smghhgc/52658367925.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/fnqWvAH/color_switch_play_on_cool_math.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/bjcAjrt/75613085999.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/C9igidb/67710609117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dobesogum/5th_grade_long_division_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/anisocitosis_concepto.pdfIn PDF document text
    • http://vapanuwivodoj.epizy.com/world_news_abc_reporters.pdfIn PDF document text
    • http://malebujezasipip.rf.gd/chummer_sr5_android.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_dad19f5cecc744d2b80db9f5ee7e7079.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedilegol/define_invisible_hand_concept.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_1b90c5faf52e490792c2597aebb35875.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_6d0995dc191f444db3ea7482b6ec8c1e.pdf?index=trueIn PDF document text
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_7f1dd596d1d844ecb4498c2a68dedb5c.pdf?index=trueIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_404f68dc13d04379ad987c0fb9461205.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_44f72f4b5e0744e88b9d48025873912f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/cbre_hotel_report_2018.pdfIn PDF document text
    • http://sorofakomefus.epizy.com/how_long_did_a_play_in_greek_theatre_last.pdfIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_f1b94cc4da354e29acb45b436611624e.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_f9059f940dae4410b3af660dbf1b7773.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_630826c1b40c4cfbaefa2b4c69d481e7.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 5220 bytes
SHA-256: 6f203f5a898f113f5e0765053230c050def7816d6ee069bc30b15a9cac75ad8b
font_01_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 10612 bytes
SHA-256: f46ccf754e49ad2165d8c48c5a29cfe03bcfe82e60b9afcf4b4445e6d3db7a81
font_02_sfnt_off0001525e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3