Malicious PDF — malware analysis report

Static analysis result for SHA-256 5644c1cb489e0e15…

MALICIOUS

PDF

70.7 KB Created: 2021-05-01 14:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aae44bec065cf55a0f6ce24ee506b51e SHA-1: 3ffd12d290d99e6893c94e3a7e3c1cd72ad34f0f SHA-256: 5644c1cb489e0e150d2fd74a1deb732374a5e9aca8cd47467726c211d9e732e3
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to search terms, suggesting a phishing or scam lure. The presence of numerous links on disposable hosting further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=minn+kota+autopilot+terrova+for+sale In PDF document text
    • http://pressit.fun/can_you_stand_the_rain_instrumentalfvim9.pdfIn PDF document text
    • http://study-english-04.space/zuxerarezimabepotu6xevn.pdfIn PDF document text
    • http://thehensleys.org/11691753544hjbnq.pdfIn PDF document text
    • http://pipvip.ru/nursing_drug_pocketbooko6sw8.pdfIn PDF document text
    • http://avit0.cc/yangzijiang_shipbuilding_holdings_ltd_annual_report_2018yv0ig.pdfIn PDF document text
    • http://obzorov.site/exponents_and_powers_worksheetazyn4.pdfIn PDF document text
    • http://biomaniix.website/245268607829kyza.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/19e4d8e2-14e4-403f-bf2c-a9e1a5aa4a6d/gumilukaxokudumobile.pdfIn PDF document text
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_0aef3d260bbb43cc80ebdc03889ac763.pdf?index=trueIn PDF document text
    • http://kusazivaseduj.rf.gd/group_1_car_seat_safety_reviews.pdfIn PDF document text
    • http://besuwodusibix.rf.gd/69788710794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3b838a-d1dd-471d-9acc-41901128822d/bemejufosaxapona.pdfIn PDF document text
    • http://duvovopuma.epizy.com/buwesededudelixukuvogo.pdfIn PDF document text
    • http://losalevova.epizy.com/71415802241.pdfIn PDF document text
    • http://bodalize.epizy.com/27030553842.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_cfc0158793ca4638bca71d8c01f16cac.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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 5024 bytes
SHA-256: c96967e7c489e96bb00d6365a4462394dcf6abde0af004ed83fbf6b6d71ef26f
font_01_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 11376 bytes
SHA-256: ad0c50b1bc6792db97ead2d5b11bccb3207fac68978c520d2adc36e19ded11db

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