Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e812d676d5cc76…

MALICIOUS

PDF

74.5 KB Created: 2021-02-13 13:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 888a539c93b2c13e644f8de7592c3b82 SHA-1: 4eedc21f968eeb9d09966bcac70864932c536980 SHA-256: 37e812d676d5cc76105ebd0b757f7708b26745b293dd2cda08f994b66b723125
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs point to various PDF files, some of which are hosted on suspicious domains, indicating a potential multi-stage attack or content redirection.

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
  • 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://bologen.ru/123?utm_term=nightbane+solo+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365655/normal_60027df170d11.pdfIn PDF document text
    • http://jixuboxa.iblogger.org/ios_13_public_beta_2_not_ing.pdfIn PDF document text
    • http://negeduji.66ghz.com/destro_warlock_leveling_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416664/normal_5fc762c1e4bf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484169/normal_5fedd19f399ec.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/ooidS09/nearby_chat_meet_friend_apk.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/88dd6d9bea0a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375070/normal_5feb7ac3581ec.pdfIn PDF document text
    • http://gevixadita.22web.org/curriculum_vitae_format_samples.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/luxelula/mudurola.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/mole_conversion_worksheet_11-_3_answers.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_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 5100 bytes
SHA-256: a7401b5ad90b83fd4f5cda32b463926327123607c445fa813cb3f3bbf80443b5
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 11036 bytes
SHA-256: bc68fbeb83b5df091bf32c71b993f041d54c1a792efa789c1d97371c9e2bef9f

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