Malicious PDF — malware analysis report

Static analysis result for SHA-256 141cf98308e5c7d4…

MALICIOUS

PDF

72.3 KB Created: 2021-05-07 18:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2349cf581029ebcbe8f186bcf4e4b1af SHA-1: eb31025d220b59837fc473c6c10f0d83fd659fcf SHA-256: 141cf98308e5c7d41dfe4462ea87276d5b340cc0703a63c2fa5619a7b098f4e5
156 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 0.9998

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=what+is+the+formula+for+a+finite+geometric+series PDF link annotation
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/repajadinolixetek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_60280c271f76a.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/taginivufif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_60543b7d80ac6.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/90947656461.pdfIn PDF document text
    • https://vutifiruva.weebly.com/uploads/1/3/4/5/134595151/45a27544bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikikifuxax.epizy.com/ethiopian_airlines_crash_report_being_released.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_d2acafee694945d79694afc58b101e70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/bootstrap_header_template_free.pdfIn PDF document text
    • http://fuzimobikuxuta.epizy.com/442675768.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_e3026c3105b1479e9130bb8e95dbccb6.pdf?index=trueIn PDF document text
    • http://satuzolo.epizy.com/allophones_and_phonemes.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/york_furnace_models.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/bowers_and_wilkins_formation_speakers.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/nujegamepuwajesa.pdfIn PDF document text
    • http://xofududegotu.epizy.com/24367537085.pdfIn PDF document text
    • http://zapidijerazavot.epizy.com/58679106834.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_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 5308 bytes
SHA-256: 39f3188706d4a492ecc3e500b7906225b8efde5806bb28d1b775e824758ec698
font_01_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 11296 bytes
SHA-256: a92b976f1a96e28725d691713a96a1af998024ae003a0563bdfaa14ca68b29f8

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