Malicious PDF — malware analysis report

Static analysis result for SHA-256 873ec95d9803312e…

MALICIOUS

PDF

71.0 KB Created: 2021-01-24 07:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dfa04f579d00677d67f5fbea1ebc27ee SHA-1: 9f0e577887c2a3eeec19dea011ea3fc94f321c2b SHA-256: 873ec95d9803312e427b7fb809928ed4a63b7f82083269afe417d89672e71e12
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 pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://traffset.ru/123?utm_term=proper+nouns+common+nouns+and+capitalization+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/puvubuzu/9hiiak6/79030357187.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/xefigoliramuxo.pdfIn PDF document text
    • https://devojakosumu.weebly.com/uploads/1/3/5/3/135314674/sorolozejizemifiwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379217/normal_6002d1e674fb4.pdfIn PDF document text
    • https://romidemifavev.weebly.com/uploads/1/3/1/8/131857114/98b200ed3743f3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450154/normal_5ff590f7b3f95.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/gcjcBtR/rope_hero_ninja_frog_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/eGfChdh/danish_modern_furniture_near_me.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/ruwitajuvejegux-lajusunijekuri.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/agj3hbH/gujarat_board_textbook_solutions_class_9_social_science.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/hw6ijha/kuporikeratumadiboxed.pdfIn PDF document text
    • https://tisudarolajese.weebly.com/uploads/1/3/0/8/130813738/7ae7b7f.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/fgghbZl/88678241187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385014/normal_5ff352c8af508.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/jbjdp2h/three_kingdoms_conqueror_mod_apk_unlimited.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_600cf4a64f0b4.pdfIn PDF document text
    • https://wiwofuda.weebly.com/uploads/1/3/2/3/132303082/mupim.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/jjbriaF/49509571365.pdfIn PDF document text
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/rakapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bakoloj/home_budget_planning_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/who_accepts_android_pay_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/70190497641.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/13571321499.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/aquage_transforming_paste_1._75_oz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 5400 bytes
SHA-256: 3fc07aed4d8a336dbb14c6df89f153af11bccee82f0fb463bbe6fb0764b4f66e
font_01_sfnt_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 9844 bytes
SHA-256: 424c72769c367e6d9459324cee4caf5a60320033479fc4ec969331c7ab40b0ae
font_02_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c