Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb52e85fa337a4b…

MALICIOUS

PDF

70.3 KB Created: 2020-11-10 04:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 43537aa4a60d4b5f89c22e065ae97b51 SHA-1: dd23dfc73c0ef5361f20125b3e991dc4d12178af SHA-256: bbb52e85fa337a4b176dace167a46082ff38cfbfd8709b683efbfb952f8e44c2
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and link farming. The heuristic 'SE_CALLBACK_LURE' suggests a callback phishing or tech-support scam pattern, while the 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://trafffe.ru/123?keyword=eldoark+classifieds+jobs'. Although no scripts were extracted, the presence of numerous external links and the ML/ClamAV detections strongly suggest the document is designed to redirect users to malicious or phishing sites.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafffe.ru/123?keyword=eldoark+classifieds+jobs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f952761d1ece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_5f9fcc8588dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422622/normal_5f9acf28c69d3.pdfIn PDF document text
    • https://wizamezuladad.weebly.com/uploads/1/3/4/3/134351213/xikojidenifufam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_5fa33ce4510d2.pdfIn PDF document text
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/ed06914c0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f891f6822227.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/tadovu/sda_church_beliefs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf6cf8a-b0e1-407a-b39a-cbef30a7b7e3/357110889.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/spanning_tree_protocol_commands.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/votoxunamoroxa.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/59228898150.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/woodlawn_high_school_shreveport_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d7a7aa-cf56-4d1f-8a27-44f7a50865c1/18718167822.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_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 5252 bytes
SHA-256: 7f3fea246fd830bc8b48e9b359507743e34289f4aec4c8f62035875b9a796528
font_01_sfnt_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 13432 bytes
SHA-256: d9ba45b9dfc6da6e361b4617f307ddd8a37fce68f645720b1998ee782a22103e

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