Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5d32058f18f74b…

MALICIOUS

PDF

80.3 KB Created: 2021-04-26 08:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7f49efbb081dc72b58717f74c68a6600 SHA-1: 2e085f42ba08efba5a8db83beb8b618b823180bf SHA-256: cf5d32058f18f74bb7e0bd386868c036ca4f0ab99969b2bd45d125eef91533df
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 hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=ukulele+easy+chords+chart PDF link annotation
    • https://dinoromakutaxe.weebly.com/uploads/1/3/4/4/134479472/1590537.pdfIn PDF document text
    • http://eagleaff.com/28847673898no2xw.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/7f8eb9b680.pdfIn PDF document text
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/ec02f92b.pdfIn PDF document text
    • http://samelike.site/aws_iam_role_policy_terraformq6y6s.pdfIn PDF document text
    • https://foxegakadop.weebly.com/uploads/1/3/4/3/134337736/kirorebakiragize.pdfIn PDF document text
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/fukogerurepa.pdfIn PDF document text
    • http://reduslimitalia.site/decimal_places_worksheets_ks2ibf5y.pdfIn PDF document text
    • http://luminar4-download.xyz/9204955851511t2o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_602b6081e14c5.pdfIn PDF document text
    • http://lovelid.xyz/41259447383oirpd.pdfIn PDF document text
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/2c79a2.pdfIn PDF document text
    • https://mizijuwewis.weebly.com/uploads/1/3/4/3/134392366/dccaeebbf49704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486751/normal_5ff5b6db3daf8.pdfIn PDF document text
    • http://meblik.su/moves_for_mortal_kombat_xl202g0.pdfIn PDF document text
    • http://nazhivy.net/28758533097d6uge.pdfIn PDF document text
    • https://jafedojinow.weebly.com/uploads/1/3/0/9/130969492/348953.pdfIn PDF document text
    • http://copyrightnotice-ig.com/does_zodiac_sign_compatibility_mattervr097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_102e438156da4ee28aba79cf6308f8bf.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_2413f95ba96f4e1ba20dce3f84bb37dd.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_a5d063b0849d420e8d9f9b59f5216c2e.pdf?index=trueIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_6c1b6775a2b94d369c3fef46ae2c96db.pdf?index=trueIn 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_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 5184 bytes
SHA-256: 532be3cf57c64667226d43300b1f7cc57097d56afef37ea92f84c06be37c29c9
font_01_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 10416 bytes
SHA-256: 24c9abb92b11e922f56cd915396f222a091d67a229fdef75b141d7e466782467