Malicious PDF — malware analysis report

Static analysis result for SHA-256 435d01a09080e7bb…

MALICIOUS

PDF

81.9 KB Created: 2021-03-02 01:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3c1abc37ea870e4b7b92c32d71bf8e22 SHA-1: 2326232d8fdcb1737093aa23e424d36e26ac5c48 SHA-256: 435d01a09080e7bb5b686857b19abf3b8dae988280012a8ac6556e57772debeb
252 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links indicative of a link farm. The ML classifier also strongly flagged this sample. The document body, though obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the embedded URLs point to disposable hosting and potentially malicious domains. The primary attack pattern involves redirecting users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=average+lifespan+of+a+californian+rabbit In PDF document text
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/7202820.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/tofisagidana.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/587847fdcc546.pdfIn PDF document text
    • http://fakibukilab.22web.org/78309127048.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/selelededewad_xajiv_jidobofidiso.pdfIn PDF document text
    • http://papotupeti.iblogger.org/xuwoludimufowulexokisip.pdfIn PDF document text
    • https://topazezinin.weebly.com/uploads/1/3/0/9/130969714/povawafaxobef.pdfIn PDF document text
    • https://bupimapigi.weebly.com/uploads/1/3/1/3/131383283/53e48131c2f3c93.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/e6249a.pdfIn PDF document text
    • http://salukapebuke.iblogger.org/dosage_of_metformin_for_type_2_diabetes.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/6536260.pdfIn PDF document text
    • http://moledibatu.22web.org/oster_20_qt_roaster_oven_manual.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/jalasilunaz/91445345854.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/what_another_word_for_younger_sister.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/lawelafaxeniwodir.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/platformio_vscode_getting_started.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_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 5372 bytes
SHA-256: b3f629017b46177483a6de3c9c617642b614a0f2f17761c14f181080349d59cb
font_01_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 10304 bytes
SHA-256: e31474045939cba2bfe0b9511ef8eb3b4dc173ec00689dcc5e64fd54d600aa07

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