Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3f9101992f1294…

MALICIOUS

PDF

76.6 KB Created: 2021-02-28 03:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eedde44bd521116b1043b6340bbd652f SHA-1: 51db1eef58f35684beef677c6db5b427e537709c SHA-256: 0c3f9101992f12946211a3967a45443b4606308750e3a4dc9bf2487de428feb5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO spam campaign. The primary URL, fokemale.ru, is presented as a search result for a specific query, indicating a deceptive lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of malicious intent, likely to drive traffic to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/123?utm_term=the+secret+river+quotes+racism
    • https://nedalejurozawo.weebly.com/uploads/1/3/0/7/130776692/1167504.pdf
    • https://cdn.sqhk.co/leruwexikud/L6yXieN/dibivejagizezireregoj.pdf
    • https://cdn.sqhk.co/napefabet/gMifhdy/hamilton_musical_the_room_where_it_happens_lyrics.pdf
    • https://zodurulamenuvud.weebly.com/uploads/1/3/5/9/135956643/1bf94b9dd2e24a2.pdf
    • http://wukosemat.22web.org/guitar_pickguard_material_sheets.pdf
    • https://cdn.sqhk.co/depivuni/oBifbii/sosokorurutezefivetawisos.pdf
    • https://sobolone.weebly.com/uploads/1/3/0/7/130775045/xalofefilaw.pdf
    • https://cdn.sqhk.co/zuxafopagad/ehdJiaZ/47853982604.pdf
    • https://cdn.sqhk.co/gobajejuz/gihbcic/drastic_ds_emulator_free.pdf
    • https://xoburevedevubuv.weebly.com/uploads/1/3/1/3/131380480/31bc7.pdf
    • https://cdn.sqhk.co/jisokemefaz/nRjESic/wezanejopokozilir.pdf
    • https://ludojuvixodezo.weebly.com/uploads/1/3/1/8/131856813/sejusuwuronu_wakosi_kometidibu_gopimot.pdf
    • https://cdn.sqhk.co/wufevinek/jfYPOjj/fitir.pdf
    • https://cdn.sqhk.co/navimoxa/djagihd/54220887463.pdf
    • https://cdn.sqhk.co/fegojujor/vpslijA/45862017933.pdf
    • http://zonamumajotodot.iblogger.org/50596569897.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gizogebinide.rf.gd/duserokizuraba.pdf
    • https://s3.amazonaws.com/zowibatev/6030037294.pdf
    • https://s3.amazonaws.com/falevi/71426986758.pdf
    • https://s3.amazonaws.com/vefagotoje/xebune.pdf
    • https://s3.amazonaws.com/bagokiko/jodabekuxobujusen.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cb.bin
77b74b498e571a90c223f8161b241697b2c91bf428fd010af737908f9baa96d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 4920 bytes
font_01_sfnt_off0000f591.bin
a1a3e604d16883d6ec63f0ab3c11ffaf65485f4cf0e6500d91dfff1eb05450cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 9780 bytes
font_02_sfnt_off00011705.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 4324 bytes

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