Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbb98283e7790eb…

MALICIOUS

PDF

59.3 KB Created: 2020-12-27 05:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 63355f5c40bc14d9a35a2f1323279e04 SHA-1: 0278d9d5351628f7d4ff2ccb733052d95bbd754a SHA-256: 6cbb98283e7790ebeab65adf9d7f8e80f044c94ede7a421fc8cbdc065693ea59
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/aws?utm_term=introduction+applied+linguistics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452372/normal_5f9f69122d835.pdfIn PDF document text
    • https://tajekuludukomas.weebly.com/uploads/1/3/4/4/134498487/fomogesemitok-noxodibogeti-koguzapivu-wufemuguwokuti.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/22014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f8e442a3ca9d.pdfIn PDF document text
    • https://boxuxalido.weebly.com/uploads/1/3/0/8/130814411/fofupubutes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_5fab00fd3ec6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fa04566430a3.pdfIn PDF document text
    • https://zerorobasajegi.weebly.com/uploads/1/3/4/7/134751736/sidebatidemexaked.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/sinalimib_zumaxupiselu_buwusin.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/1875403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_5fc76fed61e61.pdfIn PDF document text
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/b6dcfeefe41.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/zezimarofoza.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/39545ad4-cc00-4089-8091-dc52e83552bf/higher_lower_game_answers_2020.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_off0000ad3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3C 5260 bytes
SHA-256: 2049aafaf924b0a90bbd7a808707182944230a819434e4ed7f9b73d2e2065b0a
font_01_sfnt_off0000bf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2C 9716 bytes
SHA-256: 9c4b81f813dad29ea1ca1fe2d22a46d11d27bf4f27882909b62458a656e009d5

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