Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e92cc154aedb4d…

MALICIOUS

PDF

82.9 KB Created: 2021-03-22 19:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e06f5719920182424a2c8ff88c2c3b65 SHA-1: 313ff4267a5b7ab8ae890d27799d6ca454baacf9 SHA-256: e7e92cc154aedb4d88df471cc5ebc75fb3fb4aada3d884c16811330bc0767e4e
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to search terms and application downloads, suggesting a lure. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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/wix?keyword=mgba+emulator+apk+free PDF link annotation
    • http://polobasopika.mywebcommunity.org/short_argumentative_essay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_60073931b28d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_605804a3c9485.pdfIn PDF document text
    • http://sarawavenudiwap.mygamesonline.org/tinis.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/koduvujuf0jip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495551/normal_600055d8dbea8.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/dell_inspiron_e1505_memory_upgrade.pdfIn PDF document text
    • http://martans.space/atualidades_enem_2018ni3hq.pdfIn PDF document text
    • http://menformula.xyz/vozafiraxifulereqa0bl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_5fd9bb830e745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_5fda40d195676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490524/normal_5fde426dce8ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_602349721feeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4b8630e5-6188-4995-a651-832d57355dee/a_non_random_walk_down_wall_street_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c96acf-edb1-4ab1-9852-d903a459af4c/52336946192.pdfIn PDF document text
    • http://pakapenabu.atwebpages.com/vertex_astrologia.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_02b662cddd0547c3843f3bab37c97211.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_cd769f5213834181a528363951c000f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e01eea-5f30-49a3-b891-b98aa1c09ac4/66933831769.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_02f566dfd0d745b79dbd484181a1b1ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00fac21-88ab-4fb3-8d08-315fb58f8662/sony_vaio_pcg-71318l_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d769cec-138f-4d12-8a63-bebc605bcba7/57124127580.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 4980 bytes
SHA-256: fd2464447c86603be1979cd6b3f60b39e0cd7423401049098e89a5358a8f9867
font_01_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 11356 bytes
SHA-256: 5240b2867cc130476cee0ff7c3bcb20f20ec7300103f57af1f8e5b77ce666ed0
font_02_sfnt_off0001307f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333