Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e2ff9c2501a686…

MALICIOUS

PDF

73.1 KB Created: 2021-06-04 18:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6d3a4f56a69a8f750077a660e819526 SHA-1: 25b1319fb11c3a171f33e8eb237d61f6ce2569f0 SHA-256: a8e2ff9c2501a6861e5a9b6a207fceaa19ab8148bd87fc631d8e5910323c99a6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other free hosting services, forming a link farm. One prominent URL, 'https://crewmak.ru/pbw?utm_term=tamilrockers+isaimini+telugu+2020+movies+download', suggests a lure related to movie downloads. ClamAV and ML heuristics confirm this PDF is malicious, likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/pbw?utm_term=tamilrockers+isaimini+telugu+2020+movies+download
    • https://wotowabe.weebly.com/uploads/1/3/4/6/134688823/vokenowepepa_raduzora_jatasijegob.pdf
    • https://metifavogogebo.weebly.com/uploads/1/3/4/7/134716609/dugunikegaribisep.pdf
    • https://cdn-cms.f-static.net/uploads/4369915/normal_602616c149ead.pdf
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/94aca5dab5.pdf
    • https://cdn-cms.f-static.net/uploads/4382953/normal_606894cc04b76.pdf
    • https://cdn-cms.f-static.net/uploads/4465249/normal_6036590384e6c.pdf
    • https://cdn-cms.f-static.net/uploads/4447641/normal_60b7a41ba8618.pdf
    • https://cdn-cms.f-static.net/uploads/4393754/normal_60309d2000577.pdf
    • https://puliwive.weebly.com/uploads/1/3/4/6/134660228/koroginor.pdf
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fe17dc2b4f33.pdf
    • https://static.s123-cdn-static.com/uploads/4475741/normal_5fce69b880ca8.pdf
    • https://zudumatiwa.weebly.com/uploads/1/3/0/8/130873708/serunifito.pdf
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5fee820c1dea9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ddaed5c5-9d2c-40ff-8f29-c6731c0bad74/the_power_of_one_chapter_16_summary.pdf
    • https://uploads.strikinglycdn.com/files/c7f7bda2-75b0-44c3-b4f4-8363cb83f175/teaching_strategies_in_nursing_ppt.pdf
    • http://xalomuzavege.pbworks.com/f/rajevokusiz.pdf
    • https://uploads.strikinglycdn.com/files/a4dc92bd-357c-4ef8-98d0-b4a8423e93b2/schlage_keypad_lock_default_programming_code.pdf
    • http://nagomax.pbworks.com/f/81235410830.pdf
    • http://finebov.pbworks.com/f/mini_militia_old_version_2015_apk_download_hack_apkpure.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fe.bin
cd8769ff2144be94ddaa64414ef5a4a58d6580dfe54d221cb628e10d092f53a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 5696 bytes
font_01_sfnt_off0000f466.bin
25fbcae54acadc88e4f95715c9487bd3b3d1674a1c732cf1701ad1c6d78f0f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10180 bytes

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