Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a032466d6775ac…

MALICIOUS

PDF

90.8 KB Created: 2021-03-18 17:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 13a5b63b97c0f58bc4924f22da72ac9e SHA-1: 13df49d5e71d20f02ba7510c5f38282d4ad6a01b SHA-256: 85a032466d6775ac65721abbb1696eb0c12f14eddfbb94e57af3fcbc457b9483
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=2018+subaru+forester+2.0+xt+premium+review', are likely used to redirect users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=2018+subaru+forester+2.0+xt+premium+review PDF link annotation
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/foralojon_newagaleposuve_limewuv.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jheRAgc/72095141276.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/aSdhhQV/wedog.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/aQgc8jh/track_my_school_app_for_school_staff.pdfIn PDF document text
    • http://bestplacefor.rest/96901606928ylu7e.pdfIn PDF document text
    • https://cdn.sqhk.co/zeputefilu/7PXqSia/tachypnea_define_medicine.pdfIn PDF document text
    • https://cdn.sqhk.co/pepegizeso/gjcgjBQ/crazy_football_skills_to_learn.pdfIn PDF document text
    • http://cheapkeys.site/gedesadavebadit4w4k2.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuxezaj/GYc9gct/policy_expert_online_chat.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/JrfgeCq/34157681177.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/1ioja1m/nasacort_nasal_spray_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/yhb5c8F/pokemon_cafe_mix_ign_review.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/g3hcXlF/subway_surf_run_3d_download.pdfIn PDF document text
    • http://vehicleinsusa.com/how_to_change_dyson_v6_absolute_batteryv9m71.pdfIn PDF document text
    • https://cdn.sqhk.co/xisapabo/bHsbjiZ/sinanesatenofipuwopeju.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/gjhxheW/battlefield_5_not_on_companion_app.pdfIn PDF document text
    • http://agreevudb.rest/arbys_menu_prices_fish_sandwichcvnjh.pdfIn PDF document text
    • http://leree4.club/7_libros_apcrifosgcuc1.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/7550379.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/b4d3f562-936e-40fe-97ff-76865778e510/does_gimp_work_on_ipad_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad501614-35e8-4a85-9d6f-41cba77fc6fc/12653927302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0345fcc-d379-4c2f-b4f8-88dfda0ac8dc/64090754073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79dfc3f-58f6-4c0c-a71a-b26faf959146/95640457714.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_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 5832 bytes
SHA-256: 22e0c77e7350b9860734cb6d7436be5b8eaea4bed290edb9c418bbcf920ba2d1
font_01_sfnt_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 11884 bytes
SHA-256: 512dcbc74b57f7ef4664efb0d4742f498f281cacc82407a9238cd846e8ed9711