Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd6264822a5e399…

MALICIOUS

PDF

137.5 KB Created: 2021-04-03 20:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b5b8e182ed85b240b48c540c6062341d SHA-1: 1e53111d66bdfbf46779bc9d11e42807e41f8757 SHA-256: dfd6264822a5e3995d7bfe215496de855249d8c9473e2ca3a7b04b355c3b92c1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, suggesting it's designed to redirect users to potentially harmful content or phishing sites. The presence of multiple external links and the nature of the domains involved strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=planes+y+programas+2011+quinto+grado PDF link annotation
    • https://cdn.sqhk.co/muluxodipoto/aDclIhc/food_giant_ad.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/cxLi5kd/nightclub_story_mod_money.pdfIn PDF document text
    • http://lightsex.ru/wd_tv_live_media_player4xi4m.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/eTY1ijY/samsung_phone_grand_prime_plus_price_in_bangladesh.pdfIn PDF document text
    • http://topplafond.xyz/what_is_micro-expression_recognitionbsaul.pdfIn PDF document text
    • https://waramexebogod.weebly.com/uploads/1/3/1/8/131856917/mafarolikiwosige.pdfIn PDF document text
    • https://pevikotorukob.weebly.com/uploads/1/3/4/7/134708951/levijigosodazud_gubivi.pdfIn PDF document text
    • http://autobuff.xyz/bokejamibidobizivb1c5d.pdfIn PDF document text
    • https://cdn.sqhk.co/fejukomus/gdjhhCb/tupez.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/dhghgif/nba_2k21_best_slashing_badges.pdfIn PDF document text
    • http://asia.kiwi/20991602349lt476.pdfIn PDF document text
    • https://jesimubevudoku.weebly.com/uploads/1/3/4/8/134873829/soneti_zuzuba_luliripab.pdfIn PDF document text
    • https://ginabedo.weebly.com/uploads/1/3/4/0/134017532/fb1ce.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/129ffcdf2abc.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/heigsl8/70437334142.pdfIn PDF document text
    • http://adanakebap.org/39513313097pxvy3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_c147ce5e428944fbb44e17ba32c6229e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/55055399637.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_ffd54d3479b448fb9d8085c1010591d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somisilegex/openoffice_calc_receipt_template.pdfIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_bf64cbc2e0ef44dfa56f83eae72185a5.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_c06e950b48f14b95b95b76b29d639741.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_709405274a7a4d339be6b67f482ae448.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_off0001d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9AD 5832 bytes
SHA-256: b8d6261ee3fc1c06e785f50c04c5af93b24127eb2af39691ec23ee4667f37280
font_01_sfnt_off0001ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED7E 12992 bytes
SHA-256: 8799b398a4dd64baca359ef00eee593f53eb536efbba7f74257482cb8a9e42b5