Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cb678ecba25aae…

MALICIOUS

PDF

82.4 KB Created: 2021-03-11 08:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0f9fd81328a8ae83745d0340374c8358 SHA-1: a1d57f1698a86e75fac33f2dd1d231f2d8cac52c SHA-256: 67cb678ecba25aaeeae8aec86dc8cff803e61ba25d5f32d35e1d6d4ee88f7300
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://zajinet.ru/strik?utm_term=1756-en2t+programming+manual', suggests a lure related to programming manuals, potentially to disguise malicious intent. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=1756-en2t+programming+manual PDF link annotation
    • https://cdn.sqhk.co/mitajaso/ge8HfRs/98761170375.pdfIn PDF document text
    • http://net-klientov.ru/attack_on_titan_season_3_part_2_voice_actorsbxnfu.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/RZaZ0Qt/acero_inoxidable_material_compuesto.pdfIn PDF document text
    • http://naturebiolog.fun/tetifulenetezamonuzikivuot0x.pdfIn PDF document text
    • https://zozizifubigidoz.weebly.com/uploads/1/3/1/4/131409074/xalukexotilu.pdfIn PDF document text
    • http://coloradocustomelectric.com/15608096671v7q9x.pdfIn PDF document text
    • http://copyright-help-report.com/13843684268etsjf.pdfIn PDF document text
    • http://hookup750.website/what_type_of_welding_should_i_learn_firstehzcl.pdfIn PDF document text
    • https://fuwamelewupo.weebly.com/uploads/1/3/4/1/134131589/jijemev-butaxasax-jawijaka-kosafalox.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/hR9CwuI/killshot_movie_1995_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/dibtjgd/tie_dye_hoodie_wholesale_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/vofemolat/ekgcicR/jitufekiwuwutuj.pdfIn PDF document text
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/1efb9c80c769247.pdfIn PDF document text
    • http://mkuu.club/gavenar261ht.pdfIn PDF document text
    • http://alkostore.xyz/washington_food_handlers_card_study_guidepmwsl.pdfIn PDF document text
    • http://fullstacket.online/zigutokinexopupunuuop0.pdfIn PDF document text
    • https://sosuxivi.weebly.com/uploads/1/3/6/0/136056733/4683199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/78eeb3e9-0cdf-47e3-8fd8-c15991a94a7f/list_of_positive_feeling_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83299c9-b243-4213-87fb-fa400d540d23/loduxalejifev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81108601-64c5-4b5e-a6eb-98fdaf9b3e4c/black_diamond_headlamp_battery_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86503d0-7ee5-4993-8cd3-2da52de2dbf0/mens_hair_salons_open_sunday_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bbd042-0ea4-4118-8d24-d3ee3e6c216b/management_science_the_art_of_modeling_with_spreadsheets_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bd62bb-d2d1-476c-86db-d9ebf429e03c/schwinn_coaster_brake_diagram.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000119e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x119E0 20304 bytes
SHA-256: 51b6d98885296901455d36ab6ce030ca586593031baa57f84361bd48c91daac8
font_00_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 5440 bytes
SHA-256: 2ff74c45ed651b33faf3409d7611270a1fb8d41c5b96af22f88340061dd07e98
font_01_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 10536 bytes
SHA-256: 7610b32aa98cbd4332bcdcae43c4209b406f832b6475be5c72d80228ed3f7f90