Malicious PDF — malware analysis report

Static analysis result for SHA-256 145243bde2536da0…

MALICIOUS

PDF

78.2 KB Created: 2021-03-23 13:37:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca96c9fbdbd2fe055caa8980848d5195 SHA-1: d7d83fab3db1619962494c1e8ea2fd488af0de6a SHA-256: 145243bde2536da06873163ad9568c4fd533b4936226cf6e32eef2fa0b3e3e86
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 point to other PDFs, suggesting a link farm or SEO spam campaign. 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 heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

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://dafemum.ru/wix?keyword=insinkerator+instant+hot+water+dispenser+model+sst+troubleshooting
    • https://static.s123-cdn-static.com/uploads/4366020/normal_5fc8534fc1b1d.pdf
    • https://cdn-cms.f-static.net/uploads/4450727/normal_601101459921e.pdf
    • https://static.s123-cdn-static.com/uploads/4401525/normal_5fedd0d3eebbe.pdf
    • http://jakesubinosol.scienceontheweb.net/stellaris_infinite_frontiers_dlc.pdf
    • https://static.s123-cdn-static.com/uploads/4409818/normal_6003bacc72a83.pdf
    • https://cdn-cms.f-static.net/uploads/4469386/normal_601b80ce33d40.pdf
    • http://trastenmyqort.online/joxajuwejotitonarabiyiyj7.pdf
    • https://static.s123-cdn-static.com/uploads/4493553/normal_5fe3038988ce2.pdf
    • https://static.s123-cdn-static.com/uploads/4465147/normal_6002d52763857.pdf
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6015bd83714ee.pdf
    • https://static.s123-cdn-static.com/uploads/4406455/normal_5fe00b392802e.pdf
    • https://cdn-cms.f-static.net/uploads/4387938/normal_603d136c70feb.pdf
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5ffccea59ad59.pdf
    • http://itanto.space/love_story_movies_bollywood_2018-_19caigy.pdf
    • http://vepenuvix.mygamesonline.org/old_rugged_cross_lyrics.pdf
    • http://jemulobapamiwu.mywebcommunity.org/new_testament_church_of_milwaukee_website.pdf
    • https://cdn-cms.f-static.net/uploads/4424991/normal_600ffec706b26.pdf
    • https://cdn-cms.f-static.net/uploads/4426679/normal_60586dc019481.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_77d8a8fefb1742a0afedc3c1788f761e.pdf?index=true
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_3789ba283a5042668345ad1ea20859b2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e487.bin
360fd046fe9b1743490c28b12ae51ac8d0f86b9052d7a40ff5f3a9794b98a5f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 5488 bytes
font_01_sfnt_off0000f706.bin
b390312c28d2991f9b858eed7fdc0dab359a591bb4b17769ee86d90334186fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 11096 bytes
font_02_sfnt_off00011cce.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 4324 bytes

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