Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03c67e712cc7f1c…

MALICIOUS

PDF

76.9 KB Created: 2021-02-16 22:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0b559fd2832f8204f02b1e49b1a6ce1e SHA-1: c2976d27f4cdb6362e4cc5ed35b61f7a0fdb2218 SHA-256: d03c67e712cc7f1c27a9c68a23b1a3d8942a713def52339a1aa23b8389b94642
186 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, many pointing to disposable hosting or using UTM parameters, indicative of a link farm. ClamAV and ML classifiers identified this as malicious, likely a phishing or SEO spam campaign. The embedded links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=what+personality+types+are+compatible+with+enfp PDF link annotation
    • https://rogipusuwegurak.weebly.com/uploads/1/3/0/8/130813654/831ab4b563.pdfIn PDF document text
    • https://cdn.sqhk.co/lobaluxomo/gdDgigg/light_purple_room_decor.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/tzhaGJt/nemutotumusi.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/tufikepit.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/7874295.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/ahcAib0/spooky_halloween_noises_free.pdfIn PDF document text
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/saxajegeduxija.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/johcjeN/run_lola_run_review_rotten_tomatoes.pdfIn PDF document text
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/2d6f993be79.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/9e07f15b.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/liziwijijubodukum.pdfIn PDF document text
    • https://cdn.sqhk.co/rujosupatebu/ejcgjic/47098246620.pdfIn PDF document text
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/5013299.pdfIn PDF document text
    • https://cdn.sqhk.co/fufeboxeri/heidtdy/snake_game_nokia_n72.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/feLhaQC/ice_cream_truck_menu_shirt.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/nigimul/tuziw.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/musescore_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/rujaniripu.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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 5604 bytes
SHA-256: d9c809fcef7f99ebc88d8fe79cdc64eb613813a5ab353a3c1750dc83dc7125f7
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 10280 bytes
SHA-256: 8dfbd75459f4554706a72d8882e97880712e4e998163160269456fc6aa66c8c7

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