Malicious PDF — malware analysis report

Static analysis result for SHA-256 918a68a19cda2f33…

MALICIOUS

PDF

82.0 KB Created: 2021-03-21 01:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b24f8e2761964c802faaefff77869c4 SHA-1: b03302cd0b9f8f1549a0a810c36763c6fe01c8b0 SHA-256: 918a68a19cda2f33e8437f130009f61e91c06950dc19b14c4cbc1f7ce94e5e8c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious websites. The ClamAV detection and ML classifier also indicate malicious intent, specifically flagging it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/123?utm_term=android+7+change+alarm+sound
    • https://cdn.sqhk.co/watexoba/giMN3uo/90828264620.pdf
    • https://cdn.sqhk.co/zokelofid/eiaWlcK/dosewexedemisakamozudu.pdf
    • https://cdn.sqhk.co/nemoludajedu/3tVidih/moxim.pdf
    • http://tulavesew.getenjoyment.net/who_do_i_call_to_fix_my_dishwasher.pdf
    • https://cdn.sqhk.co/jukowejazus/hcuwXSL/dapojowuwusuni.pdf
    • https://cdn.sqhk.co/bafiweba/0ojf8Yi/tisefetutoxaju.pdf
    • https://cdn.sqhk.co/xifobariw/2qUOher/ey_breakfast_briefing.pdf
    • http://toworugesolur.getenjoyment.net/38024080160.pdf
    • https://cdn.sqhk.co/vefemonuru/jh0iizn/astronomia_piano_coffin_dance_meme_mod_apk.pdf
    • http://vuwefedope.sportsontheweb.net/rumudofijilitupo.pdf
    • http://lamejix.scienceontheweb.net/39348694574.pdf
    • https://cdn.sqhk.co/genopeno/bhagfa8/fuvamuda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sizabo/41818008950.pdf
    • https://uploads.strikinglycdn.com/files/016a43b8-6b38-4c94-82b4-60c7391fb198/how_to_tell_if_your_acne_is_healing.pdf
    • https://s3.amazonaws.com/ligole/zuzuluwoxogivakezasamegu.pdf
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_d9a5e3d3bd4442e29a5ab294c0d7aa3c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a2ff0ec-a710-4c9e-b7e2-0e174d35c098/34106400994.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/pradhan_mantri_awas_yojana_gramin_apply_form.pdf
    • https://uploads.strikinglycdn.com/files/299efffa-f397-4eb5-8e9e-f493d2cbc457/how_to_get_your_permit_in_mass.pdf
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_ba9376d390ec44ec83beebe7b5e55d07.pdf?index=true
    • https://s3.amazonaws.com/kibavutibeved/71093669091.pdf
    • https://s3.amazonaws.com/luxaduzimase/8763139031.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_off0000f58d.bin
488cba404be2188696853d18f56f99b7b6758514ccb8b48c3c842b9ea27e7c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 5224 bytes
font_01_sfnt_off00010715.bin
ed7acb85b7307ed87ed182e77cb11577ef30c29367cdc53fb06bbd03c4fe4a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 10928 bytes
font_02_sfnt_off00012c54.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 4324 bytes

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