Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e25849f57dcd67…

MALICIOUS

PDF

83.1 KB Created: 2021-04-10 02:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 911df9185e3f1c6451bc4358a4787032 SHA-1: 24521445e8e5db1440768550b7c9dbc2c101292a SHA-256: 85e25849f57dcd675820f81851dd3e595d100fdff1f9597a72fbc3bee68b1780
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 of which point to disposable hosting or redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or spam campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=how+to+use+cisco+phone+camera PDF link annotation
    • http://shtampshop.ru/dudanokimepofevazeretomyqbq1.pdfIn PDF document text
    • http://lassituda.online/vemudalazulanumivo9addd.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/ffc09cf8-1bf6-46fa-b874-53c80ff7c02c/where_to_place_tens_unit_pads_for_shoulder_pain.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_58bd65f747ab4646aba0f991dd75f04e.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_b3d3172ba6344a6e8335b22bccdb07ea.pdf?index=trueIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_38c1679e134f4cd59f81a408833fedaf.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_33dffca938ae4763b18e3507feb93464.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_10216fb7536a41de8b9b33fec2c9379c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/hanford_ca_water_quality_report.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_1075e80ca02d495bb14afc01b93bbc01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e382e9-ed17-49b9-8a6d-69382bf24d85/45885353227.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/jamburi_scout_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0e5d73-1aa6-47de-93f8-12f322c87ea9/troy_bilt_2700_psi_pressure_washer_175cc_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d0758f-61c7-4b39-b43d-e3e334d93b6a/what_is_the_concept_of_rehabilitation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0afe05-d0d0-4e0b-b530-255bc2d2ee57/how_to_get_a_replacement_medicaid_card_in_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0ba7d9-be4b-4124-9f69-e673eb2e541b/introduction_to_fluid_mechanics_8th_edition_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06999fae-338a-4330-a105-4c4544983c23/what_age_is_hobbit_good_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a36468-6bb4-4561-b292-8800b6c966da/xfinity_voice_control_remote_setup.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_b9a072292c4f4fbebbb90bb215a6ea9a.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_3540d097454e4e749ec424450433c450.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_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 5196 bytes
SHA-256: c8eb70a437033e6e3866928e78afd5b634bfd1e33aad3d3fd741633737bf0a77
font_01_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 11668 bytes
SHA-256: 22bf6233538521c2e42fbea78580bc9e7b892bbb5034f1309dacb914cd93b76d

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