Malicious PDF — malware analysis report

Static analysis result for SHA-256 8306b1952fad0575…

MALICIOUS

PDF

82.5 KB Created: 2021-03-31 02:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4e00644774d9a4640a1a372e4b02e1c SHA-1: 45940bf23e976e19065b499a6e256e04d2d789e5 SHA-256: 8306b1952fad05759efc69a521bd335a59c7edde63d7b2b7321abeb353a4808d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely for SEO manipulation or to serve as a distribution point for further malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or malware distribution vector.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=how+to+cite+a+pdf+from+a+government+website+mla
    • https://cdn-cms.f-static.net/uploads/4424996/normal_6051bbb4e09aa.pdf
    • http://bottlechainworld.com/moonlighter_weapon_guidez9knc.pdf
    • https://cdn.sqhk.co/legusovej/hijhiys/anti_terrorist_rush_3.pdf
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/zupid.pdf
    • https://cdn.sqhk.co/lilaxikixo/igvrhgN/minions_movie_300mb_free.pdf
    • http://price-list.moscow/88122474423dlebv.pdf
    • https://jinogujejimitad.weebly.com/uploads/1/3/5/3/135392391/dca897624024c.pdf
    • https://cdn.sqhk.co/baresupujar/ihw5C1X/99135607729.pdf
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/1c68d7674f7cf4.pdf
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/2544510.pdf
    • https://gunupilerupuva.weebly.com/uploads/1/3/1/8/131871796/xonudolame-kiputa-pojivotab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6c37f74b-b7dc-4223-beac-9e3de817b537/how_to_write_measurable_iep_goals.pdf
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_0d1c1591673f44088817dc627050d561.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5e0a9eb-91a7-4d22-a73a-fce98c8a6fdb/tofoxaparukapo.pdf
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_89ac95b1df364943b7b4aa95111e8b7f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/daebaf2c-b000-4086-be2c-9419dba918a3/platos_apology_of_socrates_audio.pdf
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_aab126eef9b743d3a704440d91fe3b29.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0993cab9-03c1-49db-9103-253fd3788a49/how_to_play_johnny_b_goode_on_guitar_chords.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_off00010286.bin
0352080936065b777c78e0530e33950f3ba946bcd648f02c778c6a3d3d152b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 5728 bytes
font_01_sfnt_off00011605.bin
837509a412a20c8bdea0958cf29a101ed65ab4988fc6f055e931f598597f7005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11605 11396 bytes

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