Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcccdd857fa061be…

MALICIOUS

PDF

84.6 KB Created: 2021-05-15 21:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5c15710057d959a72381110993763523 SHA-1: 2a6214f165bec3dbffa3aa23a2676fdc4ef0cc16 SHA-256: dcccdd857fa061be6eaf5c2e641a051a830f713f45a8da7a456da56e3a57426f
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous URLs and the heuristic firings for malicious redirectors and link farms point to an attack pattern focused on directing users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+the+best+braun+series+7+shaver In PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/mutunilideboregeneza.pdfIn PDF document text
    • https://cdn.sqhk.co/berazanoga/jecNicA/world_market_furniture_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/yheOk9V/44543390517.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/sApgegh/bewars_movie_video_songs_3gp.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/hUjjbie/51526706302.pdfIn PDF document text
    • https://jonexizuli.weebly.com/uploads/1/3/4/2/134235370/faece40ae593f.pdfIn PDF document text
    • https://fadexawotizetav.weebly.com/uploads/1/3/4/3/134339615/5d0655d7.pdfIn PDF document text
    • https://zewajala.weebly.com/uploads/1/3/1/3/131398225/7fa79f9c0dad9a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_6001d992a825e.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/ehghJ15/download_aplikasi_zarchiver_pro_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/ijiUTjd/46446810850.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/xhaqLgc/advance_auto_parts_houston_tx_77023.pdfIn PDF document text
    • https://fupevigojajoma.weebly.com/uploads/1/3/0/7/130738700/3932328.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/0xpighd/bamezapufurasil.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/aE2gdia/4995131824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_6013cc0ed4b89.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/tobaziw/great_mailchimp_email_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/fundamentals_of_electrical_engineering_giorgio_rizzoni.pdfIn PDF document text
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_1636819d3798463ab3e39fe2b146550e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vutame/2903724144.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_95bf80695e71471bb4ab6cc8c677ab41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/horizon_zero_dawn_trophies_guide.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_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 5032 bytes
SHA-256: c2f168f3c12c964a1caab4f2290e03eb0762a316d2f7a5377faaa377a4e0f147
font_01_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 10736 bytes
SHA-256: b9167d56cc30c5c52d869f78ff5f7a2bbea94616e8c2a3d163653ea6de7d3a5d