Malicious PDF — malware analysis report

Static analysis result for SHA-256 a043027f33ee173c…

MALICIOUS

PDF

81.0 KB Created: 2021-02-15 11:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 174119d9c80518e9c5a62f4c1d756ce6 SHA-1: 0a2071f8e4e9e06e850c246afef6967e0a2aa7b4 SHA-256: a043027f33ee173cab2950c4b66802b2fec76be33fb6efc000f1683f520c8225
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of embedded links, including one pointing to known malicious redirector infrastructure, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct user-facing content that would explain the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=hangaroo+answers+movie+title In PDF document text
    • https://vinovubetiloj.weebly.com/uploads/1/3/4/6/134679092/vatawes_bivifuzudesogi_widulebag_feronuluku.pdfIn PDF document text
    • http://lnstagramsecurity.net/change_background_color_android_browserxe356.pdfIn PDF document text
    • http://detonic-de.website/lost_in_dreams_guideuz58s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_6008538b1415f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385197/normal_5ff6970c928ca.pdfIn PDF document text
    • http://donbetosstreettacos.com/pvcb6b9a.pdfIn PDF document text
    • https://kapavumir.weebly.com/uploads/1/3/5/3/135313873/84a89cb2430.pdfIn PDF document text
    • http://wegansit.space/74539742556tqg5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371543/normal_5fe45f093916e.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/b1836cf66b540a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_602929ab9e53d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393759/normal_6008e5d813696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_6009cae00b88e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460708/normal_601fb06a773e3.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/7528873.pdfIn PDF document text
    • http://hamsterbig.com/pumuxevekebizoxipulamoxghx88.pdfIn PDF document text
    • https://vuwibisi.weebly.com/uploads/1/3/1/8/131856279/9501647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_602189027d8f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 5120 bytes
SHA-256: 8c11b0641dfadc5d501d0662494e7011aad017f25b0be2dc8ba4dad9ae726ac0
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 10428 bytes
SHA-256: b174f502153e5a0d246a1be69ea005e16955d695c848288b9d4cee9525bb34ff
font_02_sfnt_off00011de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 17032 bytes
SHA-256: 0b95cd2d2c671e4a69077c9c8076b14f39f7c09eec180ebb2fed8397a19c01dd

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