Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb1d55636c3fd00…

MALICIOUS

PDF

77.0 KB Created: 2021-03-08 16:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d5bf5e183980fb89bf98c8bd6947250b SHA-1: ec5cbb04859ab87e576edfe663b696edc6cf2ba0 SHA-256: 0fb1d55636c3fd0010cd1c7c4291b14c8202049eefba7af1703a84535ee04d02
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to malicious sites, potentially for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=marcy+me+709+recumbent+exercise+bike+target PDF link annotation
    • https://votokivefanatu.weebly.com/uploads/1/3/1/4/131453133/romubewul.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/vozelel.pdfIn PDF document text
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/5463122.pdfIn PDF document text
    • https://xavaruren.weebly.com/uploads/1/3/1/3/131383751/wuruvevonajifaj.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/84e92790b6e7.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/nepuginubup_palixot.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/363898.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butadiviwev.rf.gd/43354749634.pdfIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_145550fc2c5f439e9c4dc33664c41746.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5f68a7-6454-4dd2-bfee-69a2579a42d7/zepoz.pdfIn PDF document text
    • https://654adf47-851f-4126-80e4-9d8bd98a3ed9.filesusr.com/ugd/b5472a_9231d3ba448d4f8fbb464d97d9fcc281.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/846b6373-c404-4087-874d-d553dd047344/pokemon_heart_gold_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7abfad20-943a-45f0-9296-74b26ebc3e85/remington_700_adl_243_accuracy_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/jigab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341648f2-07fd-4480-b2d4-730c5eeb6dec/penny_stocks_to_buy_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484ff1aa-23c1-481f-8880-246ddb5f7d34/pobuxigit.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/apocalypse_child_full_movie_free.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_e1c3f35fd8624459a2ada19bce91ebb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/75782924160.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/monthly_quarterly_and_annual_payroll_reports.pdfIn PDF document text
    • http://nimunofat.epizy.com/blouse_cutting_in_tamil_free.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_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 5844 bytes
SHA-256: 74ff70bd2e9d20e03d4f4d5106b1f5fba0c62932f9f00c126fed140c56d2e194
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 10320 bytes
SHA-256: abdc2c9c10e589558374157a4b246d239e1a88cb8809ab3c12cd6cd470a211ec