Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a44f9b77c6d30dd…

MALICIOUS

PDF

78.9 KB Created: 2021-05-01 12:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b4afb3bf2323a805913ef7859116587c SHA-1: 5a0479d9cee702a7504aacc81d4031afff04f4eb SHA-256: 8a44f9b77c6d30dd731282c683354a40ffc6146c5053c67462102b61933600d3
186 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 disposable hosting or redirectors, indicating a link farm or phishing operation. The primary URL, 'https://zajinet.ru/strik?utm_term=is+dmv+open+for+real+id+appointments', suggests a lure related to DMV appointments. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=is+dmv+open+for+real+id+appointments PDF link annotation
    • http://lirebuwoke.mygamesonline.org/12732985248.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/arqueologia_biblica_ilustrada.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/b9996ae9.pdfIn PDF document text
    • https://runolenasugu.weebly.com/uploads/1/3/4/7/134765044/2003902.pdfIn PDF document text
    • https://kamowomol.weebly.com/uploads/1/3/4/3/134371521/pobuzuja.pdfIn PDF document text
    • https://terumadepomajok.weebly.com/uploads/1/3/4/3/134367642/6020669.pdfIn PDF document text
    • https://tosufiriro.weebly.com/uploads/1/3/4/4/134472590/mefewetuwifusop.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/toduninew-vogat-kijotizajuzamal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/851b10ba-f2b3-4c25-95f2-e0b0cddf5cf8/46107571526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33ae21b-18a6-42ad-9161-f8f25af2c52a/what_do_obd2_codes_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c19c1a-f69f-4d65-8ce4-c9176d348d7d/p90x3_classic_schedule_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f683805b-b41f-43c9-8f89-387e4533a9d0/five_nights_at_freddys_game_online_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e30658a-1f33-4e01-8cdb-4605d0dc41af/63790898539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae0da77-d613-4bd1-84fb-6458fded145a/49759873312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa662082-f450-4130-a7fe-c08900f0e92a/fuji_xp70_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fcd81a-4213-49e5-aff0-5a79c435cd84/how_much_does_rf_lash_boost_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/433280d9-897c-4e3e-b4fb-81b409fa19c5/27135704501.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 5184 bytes
SHA-256: 37ba754d085e770d694102fdb9df6c6e54bb3130e2f02720d7299e7b12f89052
font_01_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 11364 bytes
SHA-256: 4c52c8b2d6ed98ba3226fd85b68527424865c5b8426ac9356badb3a5609f891e

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