Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d619c521da094b4…

MALICIOUS

PDF

64.8 KB Created: 2020-11-26 15:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a1b8368c866cf28a597d0dab6b360c5f SHA-1: 78d9ad9ac178dec7f09476b6ed34029305840acc SHA-256: 8d619c521da094b44765e6ee07eb67fb3fc07605fa5dab22f98c230784a0a4ab
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or distribution mechanism. The presence of 'utm_term' parameters suggests an attempt to track or manipulate search engine results.

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.
  • 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.
  • 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://traffnew.ru/aws?utm_term=olympus+camedia+e-+10+manual PDF link annotation
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/9017264.pdfIn PDF document text
    • https://zatafepe.weebly.com/uploads/1/3/4/0/134000007/mutavijefuwobub_rizidunamoleke.pdfIn PDF document text
    • https://foravozivosuwu.weebly.com/uploads/1/3/4/0/134042788/lomidizokonoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5fac2a5f7b27f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_5fa580cde33ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5fb02f0b58eba.pdfIn PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/sigix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5f97a81451536.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/4893189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f8963d72a089.pdfIn PDF document text
    • https://gejosabuvin.weebly.com/uploads/1/3/4/4/134457948/gubafowalojusu_tisiwilo_jadenugatateb_vowukagixe.pdfIn PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/kujugubotufawaselil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_5fba61f506650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459936/normal_5fbc64605585d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e66c194-a1b4-46a2-92fe-f154d5be15bc/11944780315.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/laticrete_9235_sds.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/india_map_with_rivers_and_mountains.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_off0000c254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC254 5476 bytes
SHA-256: bc5d3ce4cbd4c9cadecd359202f3ff26179b99a829f13a649495c04f886d405b
font_01_sfnt_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 9660 bytes
SHA-256: 181f0b665788f0921061ac6af04aee4d90793882f745d7fb9db02653c7db6559

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