Malicious PDF — malware analysis report

Static analysis result for SHA-256 726cccdb0a8db12f…

MALICIOUS

PDF

73.3 KB Created: 2021-03-27 23:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d56f23aaa49fa2166c1783e37a0378c3 SHA-1: e9c8fddce47bb8c0bd0c80170cd930b8db46b5f2 SHA-256: 726cccdb0a8db12fdff83704f3f8957c5fc3f8a5f03691e7404394f957b1dd41
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a URL with a 'bitcoin mining free android' utm_term parameter further points towards a scam or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://xezojetit.ru/123?utm_term=bitcoin+mining+free+android PDF link annotation
    • http://chunyoo.com/how_to_fix_broken_sliding_glass_door_lockjg4og.pdfIn PDF document text
    • http://lovemecompletely.com/mavapaxadawuvejosijuduwiz8ptdi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463794/normal_5feced65b79d5.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/5536bd2eb51f37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_605f4bbb4142d.pdfIn PDF document text
    • http://tafedudim.22web.org/buscopan_injetvel_bula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453108/normal_600920eb6041c.pdfIn PDF document text
    • http://verifybadgehelp.com/firefox_apk_for_jio_phonemhj30.pdfIn PDF document text
    • https://kabokikofonesa.weebly.com/uploads/1/3/1/6/131637300/8717209.pdfIn PDF document text
    • http://lexidubug.22web.org/chita_chola_see_the_darzi_mp4.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/97cf222097e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_1e73e0ef9f594989832823ba63e0e486.pdf?index=trueIn PDF document text
    • http://fiviwuzovalexop.rf.gd/canterbury_tales_translated_to_modern_english.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_fe83b904a9c24b76b0edf117d712d4bc.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_a40e14dd0ac943928906bbbbfbae6263.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosego/75168705301.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/aging_report_for_accounts_receivable.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/gusikazogirusejobunebuxa.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_ad2b81b8552846008d4221335f874106.pdf?index=trueIn PDF document text
    • http://pugaperis.rf.gd/39333888323.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_7f30ce03216f4de0b3a08f2c9059104e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 5180 bytes
SHA-256: a7a4dd0bec66446ffd655f88fc8ab7e0f825d7ca0ac71362728fe1a114fd1e0b
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 11156 bytes
SHA-256: 727f47b327cfa450f205fcb842aa1c47646e5b4732027ec37bb690f81d3bca87