Malicious PDF — malware analysis report

Static analysis result for SHA-256 a192f383cf88b445…

MALICIOUS

PDF

80.9 KB Created: 2021-03-09 08:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8f946d47d450a4ef84211f9303796a7b SHA-1: 2c233ac4298fe12bb445c3bf8c4d3a089d31c518 SHA-256: a192f383cf88b4459aca341ad69046ace230ddc01a2f5ee0efa2abe787e7ac60
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV as Pdf.Phishing.Trojan. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics indicate potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/wb?keyword=is%20little%20fires%20everywhere%20a%20book PDF link annotation
    • https://setasavapu.weebly.com/uploads/1/3/2/6/132683041/pifumowemuxekojilib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383146/normal_5fe517c1c02a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_5fd9a1d4af3df.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/how_do_i_reset_my_funlux_camera.pdfIn PDF document text
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/3433722.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/f6c49f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5ff503825c363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_6016e8ac31461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_602c70c909618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_602ae7e953e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_6046e50b325b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_6013e9d3eb114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_6033c95d7117d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_60203c1aa6c73.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/ff2f787d3418c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nimuwet/98963270819.pdfIn PDF document text
    • http://benamow.myartsonline.com/roland_tr-808_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/kolexukegojurarux.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/manozibiwudotoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/susapatuwemivam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 5248 bytes
SHA-256: c51857fbdc757873fb005285d4589d3ed32104d19e8fc5b77f6f6a572e639929
font_01_sfnt_off00011391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 10300 bytes
SHA-256: 73fdb686c1ef291e4709401a0c33cf049945a44043a91f74bdd2688512dd4dae

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