Malicious PDF — malware analysis report

Static analysis result for SHA-256 397cddbc85d9cf0c…

MALICIOUS

PDF

67.3 KB Created: 2020-12-23 20:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d21b7a693690b615a5f6bf7b26be4981 SHA-1: 95e2f3add819fb4b8bb13a9ad45102391cf74211 SHA-256: 397cddbc85d9cf0c3a5329413bb446f8bcf0a2400a7ddb1007fcc66503ffd557
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and the document body suggest a lure related to sheet music, which redirects to potentially malicious domains. The presence of numerous links to disposable hosting services further indicates a phishing or malware distribution attempt.

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 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=b%25E1%25BB%25A5i+ph%25E1%25BA%25A5n+sheet+music PDF link annotation
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/berivijutopo.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/9441763.pdfIn PDF document text
    • https://mumifigade.weebly.com/uploads/1/3/4/3/134314269/dekujegeduxijijepun.pdfIn PDF document text
    • https://jemexegotida.weebly.com/uploads/1/3/4/4/134464186/ledomofufadaw.pdfIn PDF document text
    • https://jupimoxojufe.weebly.com/uploads/1/3/4/8/134860775/zexuzagis-dolud-gosulidudiduv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461746/normal_5fdf82e03465d.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/vijekiligunefititi.pdfIn PDF document text
    • https://bowepatajipama.weebly.com/uploads/1/3/1/4/131438296/7438323.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/titugome/what_role_did_religion_play_in_the_enlightenment.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/free_chromatic_guitar_tuners_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/75831052612.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/english_synonyms_words_list.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/29218925812.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/liwaxefugojit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a0fb72-659e-4b17-9fb7-785f7050edc3/32089917940.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_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 5252 bytes
SHA-256: bfb3efd9422dba132487f1d28526607920ccdd0cbc10001eff0b1479e24e3bbc
font_01_sfnt_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 10692 bytes
SHA-256: 887d27be8a8556db4c9e1128fe54de6a81ca2700b3bf816958f03bf8dcfc0bd8

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