Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf76b5b6569808ed…

MALICIOUS

PDF

78.6 KB Created: 2021-03-29 05:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 52b5ddc7db6f56febacaf9637a840ad7 SHA-1: 7f480e1975c2fb506becd205ec9a395633ddc943 SHA-256: cf76b5b6569808edc92fff19679772682f9a5af20ce9d0760ac69619295039b5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on S3 buckets and CDNs, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=suzuki+quadrunner+250+oil+filter PDF link annotation
    • http://wusodopepufex.66ghz.com/fikanivamenedelorej.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/gf2hjh5/drift_car_city_traffic_racer_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kagitenoru/fgjGw4x/tonifimelukux.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/W2fJ6ox/russia_victory_day_parade_2020_live.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/agjqbid/atomic_bomberman_classic_online_multiplayer.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/ieibicX/65768672334.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/domororofetonim.pdfIn PDF document text
    • http://tozonofer.iblogger.org/analisis_granulometrico_de_agregado_fino.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/3ff15dd41e8106f.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/xubifupi/14090081432.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/android_emulator_linux_mint_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/gratuity_payable_in_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/whetstone_knife_sharpening_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/fuwopidajoxigabebowapuru.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/danganronpa_v3_steam_guide.pdfIn PDF document text
    • http://buloderijapu.epizy.com/rirakomopuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e3228d-d14f-44a0-9900-dfad71e7b38a/melezugolepetilupusegukom.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/chernobyl_s01e05_subtitles.pdfIn PDF document text
    • http://tonataf.epizy.com/what_are_common_va_claims.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db359e32-198a-4953-a567-3e8f5ddc6aed/best_motto_for_sisterhood.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_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 5464 bytes
SHA-256: ac74e0e3e49de6d341aaa5f9b4a2f0999ec9aad50ffd0478bb414fb9307f4abd
font_01_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 11076 bytes
SHA-256: 2801f91209429af3aa9619033b72db97e76dee9ce9bd6f0cb4058ab40d5e2407

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