Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a27408821ff06cd…

MALICIOUS

PDF

73.8 KB Created: 2021-06-13 06:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ea1337b46584791a8d65d40827c09bb4 SHA-1: eeab3ffcb94c12109e082dd22643eb710187d804 SHA-256: 2a27408821ff06cd8c74dbc9f99fa38f92a0aa30d2a9e76389e8f62aad1a3f7f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'irlanc.ru'. The document body, though heavily obfuscated, suggests a lure related to '7th grade reading comprehension' to entice users to click the malicious link. No scripts were extracted, but the PDF structure and URL usage are indicative of a phishing or malware delivery attempt.

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://irlanc.ru/pbw?utm_term=7th+grade+reading+comprehension PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452382/normal_6052a64c69991.pdfIn PDF document text
    • https://jesokawafaz.weebly.com/uploads/1/3/4/6/134626724/nelowisi_vuzozibapagapi_jobaberas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_60c52080311d8.pdfIn PDF document text
    • https://xavubetikobu.weebly.com/uploads/1/3/4/4/134474291/d8899b.pdfIn PDF document text
    • https://nirixebuwema.weebly.com/uploads/1/3/5/9/135990662/7752523.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/7037469.pdfIn PDF document text
    • https://bawufavipefal.weebly.com/uploads/1/3/0/7/130740211/wiwereparupa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4453741/normal_60b2844ae1518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481695/normal_6055117812ab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464319/normal_605342cdd6c81.pdfIn PDF document text
    • https://dedejabo.weebly.com/uploads/1/3/4/8/134875177/nulovumuvulanas-giwefawilina-mudubopotenave-tizafobazox.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/a12fce05-4109-467e-80b9-4a3cc7d178a2/25925474718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24825bf-6b1d-44e9-a45f-713abf9e83dd/troubleshooting_fleck_water_softener.pdfIn PDF document text
    • http://guronavageba.pbworks.com/f/33973605593.pdfIn PDF document text
    • http://zilebunod.pbworks.com/f/sat_trig_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de60cd8d-88e5-4097-ae08-1f92aafda13f/31873575075.pdfIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/145203051/the_pearl_necklace_story.pdfIn PDF document text
    • http://bikitowovur.pbworks.com/f/19907299755.pdfIn PDF document text
    • http://lulatigono.pbworks.com/w/file/fetch/144539190/xawojogopibi.pdfIn PDF document text
    • http://tugewuvog.pbworks.com/w/file/fetch/145029291/roblox_hacked_apk.pdfIn PDF document text
    • http://defuveb.pbworks.com/f/instagram_verified_badge_emoji_copy_paste.pdfIn PDF document text
    • http://betifabito.pbworks.com/w/file/fetch/144805182/ccna_v7_pt_practice_skills_exam.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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 5440 bytes
SHA-256: 00933eea0b760a8a3a45deeddedb10098fa519a3715cf61ba85df4dcf7ba903b
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 10596 bytes
SHA-256: 3388dc0f263bc206b7ca62ad883e1b5264a9dd2d43b9031f8d53165f024fc4ea

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