Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d327fda420d450c…

MALICIOUS

PDF

68.4 KB Created: 2020-12-17 07:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e29aafd383bf39d3faf49740c88d14b5 SHA-1: d96cfce4a1fba7e309db896c1025fa2624c3f810 SHA-256: 4d327fda420d450c2b1211f1f641e16a8142231a7c8d543a9c35e8fd305cb29f
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

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
  • 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
  • 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://trafficel.ru/123?utm_term=chantix+side+effects+reddit PDF link annotation
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/tojemuwi_dogosinivexe_popaxokav_zisowifenese.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/bovivobokuwuk-vikijef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446925/normal_5fcce71779636.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/gidivalawoji.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/4455014.pdfIn PDF document text
    • https://kejifesabateg.weebly.com/uploads/1/3/4/8/134847793/f62c7cc1364d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5fcf4f894360c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5fd2827c2f1ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_5fb88d04249d1.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/putelekireza/55946741729.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/before_anna_todd_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25417946-215c-4d9b-8f4d-531dcdabeb7e/faxobonopemowumu.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/360_antivirus_for_laptop_free.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_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 5048 bytes
SHA-256: bc0e5493d72d2e0bd865fc192f3867fa71889a4b455263a73d5ec323bd1a8eae
font_01_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 10148 bytes
SHA-256: 4f1b693ab76e85be3849cc9bc45bfcfdabcacdd3dc79c01b1e139e06d4fb6c88

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