Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f81b366bc6e5c7…

MALICIOUS

PDF

76.5 KB Created: 2021-03-07 19:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a969f39568249749c2d52919b9e554f SHA-1: 72d4bfe3188777d6bde5d91c30d9a35bb469a40c SHA-256: a9f81b366bc6e5c7e780e39a585892e765637ded59e7e4472c3931dab3fb1d69
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly domains, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://midufefew.ru/wix?keyword=hunting+jungle+animals+apk+download
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/8804492.pdf
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/6098753.pdf
    • https://daxejinuvu.weebly.com/uploads/1/3/4/6/134645798/xeratifanopuzi-xavigimamitop-vabememezibela-dutolokabatipe.pdf
    • https://cdn-cms.f-static.net/uploads/4471085/normal_603665bf8f535.pdf
    • https://cdn.sqhk.co/jasurisunav/lqOPgjU/romawupanasogoloxaseveve.pdf
    • https://cdn.sqhk.co/gusiloxi/jhKMlHH/53068466935.pdf
    • https://cdn-cms.f-static.net/uploads/4479675/normal_600e3c51ada5d.pdf
    • https://cdn-cms.f-static.net/uploads/4500679/normal_60168cd896c21.pdf
    • https://cdn-cms.f-static.net/uploads/4474999/normal_6028e2ba55310.pdf
    • https://cdn.sqhk.co/verexoleki/dtngd7Y/play_among_us_online_free_mac.pdf
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/4117977.pdf
    • https://cdn.sqhk.co/rufopunuk/bjfljhs/international_day_of_the_girl_child_2020_theme.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mivokozibu/zewepemuva.pdf
    • https://s3.amazonaws.com/sobaketemu/history_alive_online_textbook_11th_grade.pdf
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_824b2f91b62b44aba8e020e8b9e15683.pdf?index=true
    • https://s3.amazonaws.com/muwemivumazulax/chammak_challo_full_video_song.pdf
    • https://s3.amazonaws.com/dogevazapiwediw/conveyancing_fees_guidelines_2019.pdf
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_0a6e65c568674dfe97cfd3cd0460fbac.pdf?index=true
    • https://s3.amazonaws.com/mejobu/lazuwibud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e176.bin
60b2269f377fc395d99454e33b02451d1de53d4cd02c2739294f70631bec2b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 5256 bytes
font_01_sfnt_off0000f355.bin
c819d36451fd24b6b1ad75088c5f7d9690a710e0675e162b6ab5963e32ac43be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 10312 bytes
font_02_sfnt_off0001168d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 4324 bytes

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