Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4eb4179a50a609…

MALICIOUS

PDF

76.1 KB Created: 2021-03-25 16:38:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8584145ef4f150d93d95a99d670ec23c SHA-1: 74127eaada3e48528292af26112eb0bda2ec36ac SHA-256: 1d4eb4179a50a60906066c29439b56b3b9dcf3e675cd5af6feedc625c9ba6f2a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as search engine results for manuals. The primary URL, https://pelibifir.ru/wix?keyword=moultrie+880i+manual, suggests a lure to a malicious site. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://pelibifir.ru/wix?keyword=moultrie+880i+manual
    • https://static.s123-cdn-static.com/uploads/4454813/normal_5fe3537ea3c6d.pdf
    • https://cdn-cms.f-static.net/uploads/4424043/normal_6014d5ba38dd9.pdf
    • http://krokoboko6.xyz/66073050687a0sgm.pdf
    • https://goweruvewej.weebly.com/uploads/1/3/6/0/136015665/2046584.pdf
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5ff652f86e4c2.pdf
    • http://nasty666.space/bajomapiruluwozfwyfj.pdf
    • https://pekedepak.weebly.com/uploads/1/3/5/3/135399439/kuvugi.pdf
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5ffb2035eff9d.pdf
    • http://top-salez.site/lochinvar_boiler_service_providersx95kp.pdf
    • https://suwekamepegatir.weebly.com/uploads/1/3/2/6/132682685/3324105.pdf
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/lilamu_wodonuxupawo.pdf
    • https://bafuvigugasud.weebly.com/uploads/1/3/5/3/135308410/gogibik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/teximikamukubo/noxakusapelugozu.pdf
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_9bb562e5396b4aa886fcb50698eed105.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_34f7830d0415423d8d28df126feb5e98.pdf?index=true
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_7675cc8a2d35461e9eb2fc7eeb9e49ce.pdf?index=true
    • https://s3.amazonaws.com/remuv/sony_fs5_user_manual.pdf
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_3186e9e24c944ea690a882a4198a23f9.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_9bce0fbe64e84828b50918813fae6305.pdf?index=true
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_b3bce683b776424cafce08633a56da9f.pdf?index=true
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_df4a4e569bc246508258a7109f250b0c.pdf?index=true
    • https://s3.amazonaws.com/satulibaren/kumigenesa.pdf
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_c15fd035b91e404ca93bf58e24685af3.pdf?index=true
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_bf0a4b4a33404c6baeb56965647926f5.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_off0000ec4a.bin
2d16ff9fc05ed14d87f285e556c6c8575f85c779a1b96bf006867c1cfaeedf5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 4996 bytes
font_01_sfnt_off0000fd34.bin
27718f1295b9cb5046cefbf2b4307671b34401fdd80956c63f5c57615aef00a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 10724 bytes

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