Malicious PDF — malware analysis report

Static analysis result for SHA-256 d467f0532714883e…

MALICIOUS

PDF

75.2 KB Created: 2021-03-25 16:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6941bffaf89963c98836c372564795fb SHA-1: 4a4e461ad3464981460e205512e74333055a8d4e SHA-256: d467f0532714883ef9fd45be9e4b9c5a52005d90e6369cf48291735c3d67755b
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 of which are SEO-optimized, suggesting a link farm or phishing attempt. ClamAV detected this as a phishing trojan. The embedded URLs likely lead to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/award?keyword=year+4+maths+multiplication+worksheets+pdf
    • https://cdn.sqhk.co/savujegu/u0lhigi/84401055851.pdf
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/vunipexi-tejeru.pdf
    • https://static.s123-cdn-static.com/uploads/4449990/normal_5fe1c11db30c9.pdf
    • https://cdn.sqhk.co/wekonexiw/jfjhjbn/battle_cats_all_cats_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4491151/normal_5fe1772940a94.pdf
    • https://cdn-cms.f-static.net/uploads/4371244/normal_6020527353909.pdf
    • https://cdn.sqhk.co/wesaduleb/d8hhkij/chikungunya_infection_wikipedia.pdf
    • https://cdn.sqhk.co/fimegasaz/hLRlDie/xubawebofot.pdf
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/4b2f196.pdf
    • https://cdn-cms.f-static.net/uploads/4371020/normal_603a85f345a69.pdf
    • https://cdn-cms.f-static.net/uploads/4501041/normal_60183f6779c23.pdf
    • https://zesijedoroge.weebly.com/uploads/1/3/4/3/134372038/74e482bda0cc0e.pdf
    • https://cdn.sqhk.co/bebomopakax/iaVyRhi/blue_moon_cafe_wyckoff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_a06e701614eb44259a0396597bb24330.pdf?index=true
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_1d660727eb2e4c09b39c82dd8b34ed75.pdf?index=true
    • https://93641f3c-03d3-4c8c-b6db-0fd9bfabe798.filesusr.com/ugd/384ca7_44936ed4978c4ca2a158e2ffb6b0c188.pdf?index=true
    • https://uploads.strikinglycdn.com/files/03b2b932-c795-402a-95ba-d72d8bf75f41/dowedum.pdf
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_b1e6e91e437a4311926ce7fcfe24438d.pdf?index=true
    • https://854397d5-242e-4836-9f1e-4d22a5541959.filesusr.com/ugd/88a329_44c3db0cfd1c4247b6d6c2987c909b70.pdf?index=true
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_cf3ad833714649968c8dff882eff58a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/404500d6-7309-4cb0-bd00-d23f396dd1f8/how_to_use_excel_with_formulas.pdf
    • https://uploads.strikinglycdn.com/files/7444a58b-ff58-4021-89e1-963604496097/migopijig.pdf
    • https://uploads.strikinglycdn.com/files/92ab084b-0b5e-40b2-aae8-ae44671f1041/44983329305.pdf
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_ded48891960f4a3ba8a49cf562430841.pdf?index=true
    • 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_off0000e857.bin
3fd0c47c2d6a4fba088ec67471fb0d7e32fec2c1f22047e15ce2a92f9028da18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 5600 bytes
font_01_sfnt_off0000fb55.bin
a92023941f0a1e5d43daf71ed187c66723d54aa09784bc65ab3992c987ddb55e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10596 bytes

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