Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc024106f10e57a…

MALICIOUS

PDF

43.2 KB Created: 2020-11-05 20:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4cce3f6ddd2891930de252ce07ed4f70 SHA-1: 18cd7a70f5adf882bde6a62226951bbcf20e4eb4 SHA-256: cbc024106f10e57a46326d3f5dbf74c59938d7e591ea4852ef1cc07eaec5ef12
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to disposable hosting services and a suspicious domain, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and the heuristic analysis identified it as a link farm on disposable hosting. The embedded URLs likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffe.ru/aws?keyword=vba+manual+calculate PDF link annotation
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/xenesalibozopa_leponug_mutup.pdfIn PDF document text
    • https://rofetavagamufup.weebly.com/uploads/1/3/4/3/134373504/zotifokerotedofibe.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/839090.pdfIn PDF document text
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/zisuna_xotune_jaloguzel.pdfIn PDF document text
    • https://dokipodaj.weebly.com/uploads/1/3/4/3/134306773/dilade_fowebimuxozepul_losotekigoxadob.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/a5da8a74.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/rutuv-kikawoxal-dizidewikug.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/dazifozixawus/transfer_amazon_gift_card_balance_to_paypal.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/cebuano_to_tagalog.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/16218164845.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/nissan_murano_forums_2020.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_off0000691d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691D 4776 bytes
SHA-256: b7ff1fddec3b7d6ed6d352e1c328f7f5659c4d24a2ec7e621d973b885a5e829c
font_01_sfnt_off00007952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7952 11324 bytes
SHA-256: 3dd778fbeaa9b1c4819dfdf60d8715fd5331687dcc19634b8f860bc702b95e6f

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