Malicious PDF — malware analysis report

Static analysis result for SHA-256 34dd499be6d99def…

MALICIOUS

PDF

76.1 KB Created: 2021-03-03 12:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 23d97e3b533123d683f7f2eb89c4b54e SHA-1: f21b7d428df24131a0c7a0beb60153362844fc33 SHA-256: 34dd499be6d99defa9b73999fda2ecb9ea41c8532d0342ec740a3f251c255f78
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 hosted on disposable domains, which is characteristic of SEO link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute further malware or phishing content. The embedded URL 'https://golowaki.ru/wix?keyword=proving+lines+are+parallel+worksheet' and the link farm URLs suggest a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=proving+lines+are+parallel+worksheet PDF link annotation
    • https://cdn.sqhk.co/definuseju/0kghrHi/tolipuvufovu.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/5dvfTpe/dia_de_victoria_radio_bogota.pdfIn PDF document text
    • http://chestlune.online/amman_thalattu_kummi_pattu0wczg.pdfIn PDF document text
    • https://wezefumuge.weebly.com/uploads/1/3/4/6/134614004/jodipopej-rubikorurexe-bivubebe-xilerabu.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/hh9WhfG/wasewojozen.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/ZXFGvYd/learn_html_freecodecamp.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/gfjh9jb/basekutejolukinelujosak.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubokave/cejgkAt/banud.pdfIn PDF document text
    • https://xovajuvomupug.weebly.com/uploads/1/3/0/7/130776021/1992580.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/iAig7ih/robawuveze.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/parera.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/7djfyhc/big_bang_theory_theme_song.pdfIn PDF document text
    • https://cdn.sqhk.co/rowemarul/NXii1ie/wood_joints_definition.pdfIn PDF document text
    • http://mamimufexaliro.66ghz.com/13725711859.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/cijgiSy/e_coli_symptoms_in_urine.pdfIn PDF document text
    • http://eurosett.net/template_slip_gaji26r2p.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/ijuISbV/real_racing_3_online_generator.pdfIn PDF document text
    • http://repair-planshetov.ru/stoeger_m3500_choke_tubes1u04l.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/ibgikhh/48548013385.pdfIn PDF document text
    • http://natur-bio.space/8945875051mhbty.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepuzizidokug.rf.gd/kurosurakavolegarupitu.pdfIn PDF document text
    • http://zenujasope.epizy.com/adjective_preposition_combinations_list.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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 5300 bytes
SHA-256: 34b1880e224b78ba7b35284853a81e652d82a97008b66d93068a325d7452f918
font_01_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 10760 bytes
SHA-256: 3b2fcdd70c79bebe48b2e5d1f68f7913f622c83cc81a8f4a9ddf87c499b6a309