Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfdad14f15b4e3a…

MALICIOUS

PDF

88.4 KB Created: 2021-03-31 04:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c98a17ba45f1f28eee4b13c1e55d2ff3 SHA-1: 4606f909feeaf2e2d6f665c053528be33747f037 SHA-256: 5bfdad14f15b4e3ad592c4bb10bcac5f1870bb7ba17fef06675a6dbdc1261328
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/award?keyword=water+borne+bacterial+diseases+pdf PDF link annotation
    • https://cdn.sqhk.co/daposofoxig/bhgjjhe/samurai_vs_zombies_defense_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/jVDFKjg/nobariwiwevovotawebefadof.pdfIn PDF document text
    • https://cdn.sqhk.co/gugirejol/ejhphaX/36561314317.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/1jfhEQ8/swordigo_great_caves_four_exits.pdfIn PDF document text
    • https://gutinevar.weebly.com/uploads/1/3/4/6/134611255/8160543.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/diijjhj/masegosuvoligegizalede.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/jbii4RP/15188672958.pdfIn PDF document text
    • https://veximukexapi.weebly.com/uploads/1/3/0/9/130969798/1799832.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/ywgeaiq/13582153264.pdfIn PDF document text
    • https://tonudekosinin.weebly.com/uploads/1/3/4/6/134685286/bored-tiwobozud.pdfIn PDF document text
    • https://cdn.sqhk.co/jurufovowufu/igijbje/camera_capture_image_android.pdfIn PDF document text
    • https://lujogisuz.weebly.com/uploads/1/3/4/9/134904514/48aea51d9a72c2.pdfIn PDF document text
    • https://sefenavimeta.weebly.com/uploads/1/3/4/8/134885596/4a01d85784a23.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/5429451.pdfIn PDF document text
    • https://cdn.sqhk.co/tokejosanawo/gdhdjiU/50145873975.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/hibQ01M/chocolate_covered_strawberry_mousse_cake_recipe.pdfIn PDF document text
    • https://fezewemekerod.weebly.com/uploads/1/3/6/0/136050953/1171228.pdfIn PDF document text
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/nisuwunipemoj.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/gy8zSXQ/translate_english_to_spanish_male_voice.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/MjHUibF/56083164569.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/2af002c5-1ed8-4d6b-a5f8-1aac61d6ac00/how_to_make_distilled_water_at_home_for_cpap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64bbec1a-b86d-4c80-a69c-10e19f602cc2/78316847759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6dbc67-2da5-408e-a935-161f31c97e21/wopumimavatudesufewuvadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc400ac-af33-4904-a4e4-7c1416c36dc3/4446103294.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_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 5300 bytes
SHA-256: a9875ff331f9dff08147ef1d0d1bc965022a9d733ba66aa4849e31d6eead5136
font_01_sfnt_off00012c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 11808 bytes
SHA-256: 886a1403e177882e2dabf855171226b93ebb6e4e0b9841f3ccb4d76e279cdff4