Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e2af37f605f812…

MALICIOUS

PDF

68.9 KB Created: 2021-02-10 16:22:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4e0d17f86bb2e27e0651dab735342230 SHA-1: 45f7a06e9ed0f911ca17c21ea4f1393fcab1378e SHA-256: 88e2af37f605f812018881acbe8c9352b8699aa9f3dd886eee72e54982bb3048
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=location%20unknown%20honne%20piano%20sheet%20music%20pdf In PDF document text
    • https://tebadigizowi.weebly.com/uploads/1/3/4/1/134109241/fewaneruzovofe.pdfIn PDF document text
    • http://medgaj.com/9101870448o459t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501804/normal_601c98d1572d9.pdfIn PDF document text
    • http://belldiscount.ru/67821827147gp6dh.pdfIn PDF document text
    • http://wow50.pro/34710929555iw36x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5fd203bb41bdd.pdfIn PDF document text
    • http://serdyukov.pro/33516351251j84g4.pdfIn PDF document text
    • http://vengriya.space/42543978600w77xg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384035/normal_600492f9a765c.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/3752103.pdfIn PDF document text
    • http://evakuator-uga.ru/jeparukojanofovopifhyseq.pdfIn PDF document text
    • http://tasonilevibinu.22web.org/60824810385.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/bulikowexunepov/petebebine.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/vertebrate_classification_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/addition_with_regrouping_worksheets_k5_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/apsrtc_app_smartphone.pdfIn PDF document text
    • http://babokad.epizy.com/saif_ali_khan_bazaar_movie_songs.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_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 5364 bytes
SHA-256: 49fb7d55faee25cbc8180d69f9082bff48d7f8783d31c99656fa762dc4109431
font_01_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 11704 bytes
SHA-256: a0a15362b2c4ebf4034d406574c8d1cb79a11ed80cd5f12d4a3447aa3db8e625

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