Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ef68e8b8c58099…

MALICIOUS

PDF

97.1 KB Created: 2021-03-23 05:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b2bc2318ee8e7101885a9ac24672640a SHA-1: d38961ec74b5d43a22d632d0b003a0f9f673fe7e SHA-256: 28ef68e8b8c5809949c9865561fe690756b3beafcb65ba7ade0730f83b289b16
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to deliver malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://golowaki.ru/award?keyword=amalfi+coast+travel+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419820/normal_60395b80e288a.pdfIn PDF document text
    • https://wowiwega.weebly.com/uploads/1/3/1/4/131453904/jobid.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/phihg4v/fibodozif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_603cbf53ea13f.pdfIn PDF document text
    • https://cdn.sqhk.co/xosaletozobi/jfiahgf/goatee_template_printable.pdfIn PDF document text
    • http://zapixexarepol.medianewsonline.com/30011446450.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/aq0iJhi/zafatonupewovevejexatagaw.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/mdhgibZ/nike_windrunner_black_spirit_teal_space_purple.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_6041824262f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5fea39384af78.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/OzwLCjc/dress_up_party_salon_edmonton_ab.pdfIn PDF document text
    • https://minedikatew.weebly.com/uploads/1/3/0/7/130739540/tuzuga.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/iaOjf8M/46262627181.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/DTgfhb2/misatugodetugegupirosukev.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/yard_machine_riding_mower_blades_wont_engage.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/O9hbgfN/alarm_clock_timer_online.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/blank_page_print.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/hdjg3hf/41819664224.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
    • http://gitipezusev.rf.gd/esmo_bladder_cancer_guidelines.pdfIn PDF document text
    • http://lipeporo.onlinewebshop.net/xalizipibewewebuz.pdfIn PDF document text
    • http://mijewuwusos.epizy.com/espghan_enteral_nutrition_guidelines.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D0 5300 bytes
SHA-256: 7c3f0bf776a7f66193ae8f71ba847f83252cb2d55d96507c80a6099dcbb5dc3f
font_01_sfnt_off000139d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D8 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00014268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14268 11144 bytes
SHA-256: 5d66bed42670c62907b53197f704e34a96dca2d1c038dc8ebcdce0e76d88a766
font_03_sfnt_off00016857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16857 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230