Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3a4f083f3bdbda…

MALICIOUS

PDF

82.6 KB Created: 2021-05-27 10:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 84ab3a36e3d39be1c0071a7bed22acd1 SHA-1: 70c2e7c84fccd72dec04877bb8a224588c072e78 SHA-256: 7b3a4f083f3bdbda65918a9ad044628a06e8adbe8ec29ca8e994cc4e9a8618a7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=salvando+al+soldado+perez+pelicula+completa+online+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5ff52fda87b19.pdfIn PDF document text
    • https://bivibonade.weebly.com/uploads/1/3/4/0/134041173/lisidiruk-zaxewazulutefu-sapaje.pdfIn PDF document text
    • https://wiguvufa.weebly.com/uploads/1/3/0/7/130775639/9155214.pdfIn PDF document text
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/nejaxifaweniw_noxijupok_vusijuz.pdfIn PDF document text
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/b2bf7b1bdbd43e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403415/normal_5ff81324733ec.pdfIn PDF document text
    • https://golamusexa.weebly.com/uploads/1/3/1/6/131606818/e2f38.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/5348011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_606762042e436.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/zepemezowefuzorun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_602b7c6290db9.pdfIn PDF document text
    • https://degovemidim.weebly.com/uploads/1/3/4/0/134017519/9994403.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/663e9e906ea19ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_6001d9d975323.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365541/normal_5ffc4fba433fd.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/734c7c4a-6f51-4450-b6d5-73c14da7da5a/the_stand_movie_2020_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e0531f-2490-4e84-923c-a8a78babf2b0/kegiwememij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec3b328-9457-451b-86c7-b9907dafa23a/how_many_cameras_can_connect_to_moultrie_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa0f0b5-2f65-4947-9c13-130fea387da0/46146556578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab26299-4a2a-4da5-83b4-359482158f1c/axial_scx10_2_deadbolt_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc72180-a2b1-4b87-a4f5-c95b4a95b053/tosejusodap.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_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 5604 bytes
SHA-256: b626b782cd45842ca3af3a540dbdb2e7111b5656cfcc160b5e7d60a61e405885
font_01_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 13084 bytes
SHA-256: 8b5b80274b521bf1b11684aa51bfa74e845cbdf5250d51afa46f1d5443a2a25f