Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9536fe862f6eb5…

MALICIOUS

PDF

80.3 KB Created: 2021-03-19 14:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 00049288e60fed541b60aafbe72b15ab SHA-1: 3ce0dd094bfb869149170a5c5135c574308fbabe SHA-256: 5c9536fe862f6eb50fd4d76be0c99ad582f04bd4c8e6c3a76f15e491f0342dd7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, with 'https://baarspo.ru/wix?keyword=jandy+lxi+installation+manual' being a primary indicator. The document body, though heavily obfuscated, suggests a lure related to an 'installation manual', aligning with phishing or malware distribution tactics. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=jandy+lxi+installation+manual PDF link annotation
    • http://tizezs.xyz/rifirogafajuazepq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5ff3fe2de1dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_60122d01bd82a.pdfIn PDF document text
    • http://heliusdesign.ru/mizobuff3184.pdfIn PDF document text
    • http://sokfresh.fun/ti_nspire_cx_cas_student_software_downloady0b0i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5ffd9dc6a1a41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_601c62a8c74f3.pdfIn PDF document text
    • http://chestlune.online/dd_player_character_record_sheets_1st_editionqotsu.pdfIn PDF document text
    • http://allerop.xyz/befuvodavopitiraxeruw1g4bh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412165/normal_602164f959716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_601e8fa78b6fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462344/normal_6028739987287.pdfIn PDF document text
    • http://kieverts.xyz/68994154303vgivh.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/7055e705-8298-416e-847b-63f66e2ec041/rca_atlas_10_pro_tablet_with_detachable_keyboard.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_dadd8b082b0f4290941217e2b66044fd.pdf?index=trueIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_b5dde975ef3f41858e87395036f7809b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3627914e-dc70-4749-bca4-8f166006dad2/pagibevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b33510e-07ab-4f50-9dee-5ba305d0798a/ironhead_sportster_service_manual.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_cb3a00228bd349e0a59685eb722d2a16.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_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 5032 bytes
SHA-256: c62ec8fb900e55c9f34df588a8b4918fad301a681ab7e9caaf22af55aebdb75f
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 13116 bytes
SHA-256: 1745cdc08dcf6c93cf7eae598c051046aff7070a08d44829da452c51c01466b9

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