Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed0d49974b16175…

MALICIOUS

PDF

82.4 KB Created: 2021-03-20 17:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9191e230f3329d362d8fe13231e2e267 SHA-1: 5fc9152f46f1c448d44a299e5d027c0480e3a4af SHA-256: 5ed0d49974b1617541c2c6b84dab179877fe385e65c771ff06db6cc390e1e585
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, a common technique for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=ohio+high+school+swimming+state+qualifying+times
    • https://cdn-cms.f-static.net/uploads/4371807/normal_5fdc06138e993.pdf
    • https://cdn.sqhk.co/badiwugaleko/he892he/slime_roadside_kit.pdf
    • https://static.s123-cdn-static.com/uploads/4464722/normal_6001849aa9e8f.pdf
    • https://static.s123-cdn-static.com/uploads/4530323/normal_6007736e299dd.pdf
    • https://cdn.sqhk.co/gidufulelav/ihTFidZ/best_app_to_sell_second_hand_clothes_uk.pdf
    • https://cdn-cms.f-static.net/uploads/4446784/normal_60497df678160.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jusagi/50448692403.pdf
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_48c53301844f4dcd901b4ab31392defe.pdf?index=true
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_c4e0693049e14d229cf4f069083af933.pdf?index=true
    • https://s3.amazonaws.com/pevarijidasalop/20838197088.pdf
    • https://uploads.strikinglycdn.com/files/dd592987-4c4b-418c-a703-e2d10b72b948/ravensburger_14988_harry_potter_1000_piece_challenge_jigsaw_puzzle.pdf
    • https://uploads.strikinglycdn.com/files/58fb60fd-f724-454a-8f7e-77c275b351f2/4703048382.pdf
    • https://uploads.strikinglycdn.com/files/56cf1ca3-1b4b-48bf-aaad-e50c26303985/waxiwazupedimutalunita.pdf
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_1090e48847d2453a917208ee91437959.pdf?index=true
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_ab12d7016dd244a09a2b4f1d58fd1c96.pdf?index=true
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_7b0dd4ff61ee4bfd918da63b9a176157.pdf?index=true
    • https://s3.amazonaws.com/fowonaxul/54487960625.pdf
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_ce039b325bba4219b2cda20e6099921b.pdf?index=true
    • https://s3.amazonaws.com/zuvovoxigumuz/93291368709.pdf
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_b018aff682dc445da9970bd03d03f5e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35e204ba-fa78-4581-9530-f734201c808c/kenmore_canister_vacuum_replacement_hose.pdf
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_18a444febabc4e1ca552119169bcdcfb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f570.bin
4994dd141a4f933a72b832abe74a99f4ce670be04fd515a1d7b33811ed50c1fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 5428 bytes
font_01_sfnt_off000107e4.bin
f3f6c4ee4b1b3f3028df4378c973b45e8941e5ac769065861cafb492fbefbbc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 11000 bytes
font_02_sfnt_off00012d83.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 4324 bytes