Malicious PDF — malware analysis report

Static analysis result for SHA-256 20757948a2474272…

MALICIOUS

PDF

79.9 KB Created: 2021-04-01 07:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: af48f352393ce609cf32bec9c2266267 SHA-1: e1ef4e522792988fb479ed25bf32fd0b45979ca1 SHA-256: 20757948a2474272d44acd86071a3195e0af37a58d748ccbada8d0259d764fd5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to drive traffic to potentially harmful content.

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://bologen.ru/strik?utm_term=how+to+sync+lg+soundbar+to+comcast+remote PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415951/normal_5fccb92d49a3f.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/V95jfmW/70624712729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_5fdb8f5f4e6cd.pdfIn PDF document text
    • https://cdn.sqhk.co/fujikapoji/haie7if/exploration_synonym_deutsch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_601d371d34043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_605a465322f63.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/hdthgic/69672046209.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/794a4d37-2152-4195-9d1e-c91f583a1638/ruger_p95_no_safety.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_dd882f6ac31049849dec703e4c89c115.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be23cea-e1c7-4f66-9927-1d009eadb3d9/november_schedule_2020_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c1854a-978a-4549-9208-d5b2ba7e152b/gubavidabog.pdfIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_73482e2068e146879989e11d17c6eeac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1806d1-cbac-4998-8875-4a30634c0639/amazing_bible_timeline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63456c4-538b-45b6-990e-a48e9e14b71a/how_do_i_access_an_old_google_account.pdfIn PDF document text
    • https://2a74a384-02d2-446f-82fa-9c0e1d53706e.filesusr.com/ugd/03ef8e_5b282e98c4294185a5ca8c5e10376bd1.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_ee27e9d0c66246f98979228ca414db0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35334d9-c075-4e46-a8ac-7e59a368df5b/dojuzubunakekow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dff85b7-7020-478c-8b4a-2074b49b6ede/are_there_any_recalls_on_2013_jeep_grand_cherokee.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_f366f9dc1c8443dea208d9cfbee7ef82.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/487846b1-254d-4d53-b1a7-8ddf286d18c8/28961609583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2a9d03-2414-4a66-93c6-662945458e34/56002490937.pdfIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_efa10a11c655467fbe8dadb5d91b1578.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8091bb57-b8f8-47b7-9ff3-8bd5662cb6aa/zufatewisugubufejowufilar.pdfIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_31ae6e1212654f64bc2b6458ed869217.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_bc043415ca4d461da2ec9b2eae1c6a24.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_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 5552 bytes
SHA-256: cee7295dfd917a8598fba769132c72761fb4a44c8bdda4af027aeb72cd7408a7
font_01_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 10728 bytes
SHA-256: 8ed216a61b4d8e263d1886a0262c77ce850c63cf57cc617f87a2e7d2dfc50def