Malicious PDF — malware analysis report

Static analysis result for SHA-256 b351e57694330954…

MALICIOUS

PDF

98.4 KB Created: 2021-06-07 03:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ca6cd26227ca65364651ff133c5b89c0 SHA-1: 409e208d3ad1cd79b7d4620cd6e93a171a229ee2 SHA-256: b351e57694330954e018666c9b5e9e2c940ed7b932cd755e9a59521c1ac2c0f6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded document body text, though corrupted, contains keywords like 'what time is close walmart today' which are typical of phishing lures. The primary function appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/pbw?utm_term=what+time+is+close+walmart+today PDF link annotation
    • https://tekipagitew.weebly.com/uploads/1/3/4/8/134871071/sawepi-vagipulurexo-jemagaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418786/normal_5ffe8f03c8cc2.pdfIn PDF document text
    • https://wejefagujevixow.weebly.com/uploads/1/3/4/4/134472609/winatiz.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/2897918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_60462bfd52042.pdfIn PDF document text
    • https://pumizisumene.weebly.com/uploads/1/3/4/0/134017803/5201566.pdfIn PDF document text
    • https://zavomejuguz.weebly.com/uploads/1/3/1/1/131163615/5270054.pdfIn PDF document text
    • https://bifuvabomefu.weebly.com/uploads/1/3/0/8/130814245/lasije-saxexedovigafi.pdfIn PDF document text
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/1014238.pdfIn PDF document text
    • https://jovusejafuraz.weebly.com/uploads/1/3/1/8/131856080/kuxugadi.pdfIn PDF document text
    • https://kinofipu.weebly.com/uploads/1/3/4/7/134725163/530959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_5fe7e087d74b1.pdfIn PDF document text
    • https://sotamepepoj.weebly.com/uploads/1/3/0/8/130874386/e9c1b76.pdfIn PDF document text
    • https://mirotipobidonep.weebly.com/uploads/1/3/4/9/134902528/didapinuvefeb-nemeli-wolukajo-wokof.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/6569164.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83244a4-eea0-4bbe-aeae-d647e09faecd/jotapadamobafawanawo.pdfIn PDF document text
    • http://rasetewi.pbworks.com/f/harry_potter_and_the_chamber_of_secrets_gamecube_iso_download.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/51634986433.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/wawed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/605a47a2-a2d3-4348-b556-5b4637974b13/9666476101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62580b47-dac5-4268-8c21-3ba2f503cc95/how_to_start_trading_online_for_beginners.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144498603/10221712900.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_off000141d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D2 5388 bytes
SHA-256: 17782395a9b4bc42a3a128e29fa51e2627ce91267815acb6ce3eea26b324f411
font_01_sfnt_off00015414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15414 11856 bytes
SHA-256: 52357b1076be9b82990bf959ce2c3b570f6c413b9e2c2ecdd27be5b9acaf028b