Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2856d458c279a3…

MALICIOUS

PDF

79.0 KB Created: 2020-11-19 09:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fc0533c508250f96568a2c9d129eea76 SHA-1: 1e606bbc6b456239492e1445b6ff1f3d30dc1c6c SHA-256: 6a2856d458c279a32b6bdeea99469ea8b02af94370a40db1526e8838c59a6d0b
194 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

This PDF file contains embedded JavaScript and a mass of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded JavaScript and external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/aws?utm_term=adding+charts+to+an+excel+vba+userform PDF link annotation
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/9b00d9d22.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/jikadiboposaba_sajatufobage.pdfIn PDF document text
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/9d36300623.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/begawa_lewasozefi_sowozi.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/rezovovob.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/kuxilakisezev.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/18822a5c7ce.pdfIn PDF document text
    • https://kegibaxita.weebly.com/uploads/1/3/4/6/134661687/8506301.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/jakadaworulozazur.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/fokapikow/10508162478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf010971-d352-450b-b755-a96fd8db9ebc/97198834191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106492b7-8a50-471e-b81d-57680e301f37/because_he_lives_hymn_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/shoulder_injury_medical_treatment_guidelines.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 5692 bytes
SHA-256: aef5ef5c7f9e8ff5c6953a5aefcc5d356e230dc12632cf190333f707ab7fb341
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 11156 bytes
SHA-256: ef99680590f186378ac4be634f7173c438f0892b505e211515949ae069756c03

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