Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ad4b0ed8ad7ce4…

MALICIOUS

PDF

73.6 KB Created: 2021-03-19 06:25:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32232097472e9fb0b8138889c3d0ce85 SHA-1: 20971caf95d13050d75d8576eed2332efa0fb15d SHA-256: 44ad4b0ed8ad7ce44f10571eb6e9b70d03650be4dc4046996aba075377ffd7f0
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing document and hosts a large number of external links, many of which are SEO-farmed. One prominent URL, https://midufefew.ru/wix?keyword=raze+3+unblocked+6969, is directly embedded and appears to be the primary lure. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://midufefew.ru/wix?keyword=raze+3+unblocked+6969
    • https://cdn.sqhk.co/rotefuver/zh54Dij/12956594367.pdf
    • https://cdn.sqhk.co/vavetiset/pMrQTfh/95531489330.pdf
    • https://static.s123-cdn-static.com/uploads/4383467/normal_5fe4f0ae53b42.pdf
    • https://cdn-cms.f-static.net/uploads/4462374/normal_603a559fb30be.pdf
    • https://static.s123-cdn-static.com/uploads/4443610/normal_5fdcba8831f0b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_4da8c808f4f745a5adff596256b20757.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6a73d71-a44d-48cd-aa26-7a71dba41283/17_golden_sonic_fnas.pdf
    • https://s3.amazonaws.com/nijosinizo/how_to_take_permit_test_online_ma.pdf
    • https://uploads.strikinglycdn.com/files/4d9de736-cebf-495a-9aec-d5a5157876d7/crossfit_workouts_at_home_with_weights.pdf
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_14ddf53c92f8436e9a5371083f22c848.pdf?index=true
    • https://s3.amazonaws.com/jigezilor/best_smartwatch_with_call_function_in_india.pdf
    • https://s3.amazonaws.com/wurivuve/kali_linux_for_vmware_workstation_15.pdf
    • https://s3.amazonaws.com/tuxutedi/dbx_driverack_pa_premium_manual.pdf
    • https://uploads.strikinglycdn.com/files/020c6edd-ae34-4fda-ae8e-2a3a2abd762f/literature_approaches_to_fiction_poetry_and_drama_2nd_edition.pdf
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_68f4e84f3568435bbd4f107edc25f11d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b862e827-7109-41d4-b1d4-37c8919cf6d7/47494300752.pdf
    • https://s3.amazonaws.com/kujapomib/magazine_proposal_sample.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/garfield_2_movie_tamil.pdf
    • https://uploads.strikinglycdn.com/files/c5dd434e-ec34-41eb-b0dd-e1755d5a54d5/what_is_the_easiest_forex_strategy.pdf
    • https://s3.amazonaws.com/kozewuposoridil/pokemon_x_citra_android_por_loquendo_frodo.pdf
    • https://s3.amazonaws.com/sojebelevenex/lamborghini_song_ringtone_doorbeen.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44c.bin
41f741fb046a99fa0750a3823333d20af9b1cb1b320c23f33bdad8c110c7a7c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 5396 bytes
font_01_sfnt_off0000f6bb.bin
1d76ccabedd77d59e57c5a3f61d978363a56ed7df7c6bca1ae573fe67bb6f54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 10176 bytes

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