Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95cefffe5f0bee1…

MALICIOUS

PDF

79.5 KB Created: 2021-02-16 18:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dc07c3d47ef06f750772f07f7185b5e7 SHA-1: 8861184815cddc2142050e95ba7e85ab7a1e5bfd SHA-256: d95cefffe5f0bee1b4242095b897f81ca8a8c7b04c174d7f817d6a88339c23a0
186 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 point to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=harry+potter+book+1+number+of+pages PDF link annotation
    • https://cdn.sqhk.co/konafomaz/2Tw2thi/pottery_barn_kids_backpack.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/WxFiboG/bull_run_shooting_center_learn_to_shoot.pdfIn PDF document text
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/bezuwimakuril.pdfIn PDF document text
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/pobumuziru.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/xZQbHjj/splendor_online_shopping.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/fIT1aOc/i_m_gonna_be_dead_someday.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/ufigiew/west_game_ava_strategy.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/iaHdOie/widimoser.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/xobuzewigolob.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/lidesemolif.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/9936745.pdfIn PDF document text
    • https://ratudizog.weebly.com/uploads/1/3/5/3/135323835/d707c968.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/i7jjijJ/dollar_deals_and_party_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kezinujus/kEnzjjc/gifimujiboxuvuwuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/yiehhii/home_assistant_nest_doorbell.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/xufaxoferugod/video_er_firefox_android.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/fofurilodubizusamefaz.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_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 5508 bytes
SHA-256: 6be9dd2ba3f45dae32c0d0b2175dd5e3121b59e946e20fbd5afe7c6f40eb8300
font_01_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 10432 bytes
SHA-256: 6b9539c9148462c06a1c5b4fe09d533451292e95816ad0e766a4db2214ba6784

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