Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a7b7d7bb002a7f…

MALICIOUS

PDF

83.7 KB Created: 2021-03-21 09:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 2e7e2a41ee0839e28b65b94b6876c961 SHA-1: 9659f79d6a39150b3339fe91a7042b119afe6d24 SHA-256: 79a7b7d7bb002a7f66c91c58bfd23e9ce9a2cea0011ea74696941a03332babc4
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://zajinet.ru/123?utm_term=logarithmic+function+examples+with+answers PDF link annotation
    • http://hugertely.xyz/panuxuzeu1kqg.pdfIn PDF document text
    • http://my-credit.info/9135857251wqc1m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490735/normal_5fe5433ae2ba6.pdfIn PDF document text
    • http://famekeletiti.iblogger.org/hp_pavilion_dv6_drivers_windows_7_64_bit_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_600ad607da9b1.pdfIn PDF document text
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/37e4b4ba8ba61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426695/normal_603d7c92608d3.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/dukagojadesutupiga.pdfIn PDF document text
    • http://zesamoa.online/batetafipejajojizawubesuy8rxf.pdfIn PDF document text
    • http://eurofamily.pro/how_to_pray_for_a_birthday_person1wvhy.pdfIn PDF document text
    • https://vasoxalevevox.weebly.com/uploads/1/3/4/4/134477515/nenemixuxolisuzixiw.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/9402281.pdfIn PDF document text
    • http://interbankdigital.com/interview_questions_for_retail_assistant_manager5lhw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_60559c5f11f44.pdfIn PDF document text
    • http://richteam.site/niconico_video_er6oluw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379030/normal_5fdc9b2794c7e.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/8524076.pdfIn PDF document text
    • http://devgm.design/40683095092gd3a2.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://fepoxojosatomu.epizy.com/abdomen_agudo_elsevier.pdfIn PDF document text
    • http://kokitivem.rf.gd/24212890464.pdfIn PDF document text
    • http://womumilo.epizy.com/poster_presentation_template_free_a0_size.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 5412 bytes
SHA-256: de7e425368bcb74d90c6ded3096964ddc9f1f431f1d82b51180225c17b4e30d8
font_01_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 11380 bytes
SHA-256: 652b59763c2399e06a7cdbc2847a4319b30d335b8c304f0a13e961ea473d30fa
font_02_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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