Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3adcd627aa7365…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 02:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96aff2598aa9f2d8ee72c7731fe5a0a3 SHA-1: 11705fd5f335f38024ba2ae6ecf2176edf572c65 SHA-256: 5b3adcd627aa7365d45b3a9bf0e3216b3cde194a0b6c2c7e4f9e73a5d5f83b04
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm for SEO purposes, with several pointing to suspicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute malware or phish users. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=affective+computing+book+pdf
    • http://sis-paypal.com/24647323345r3rjh.pdf
    • https://cdn.sqhk.co/talexadu/cia1vA0/35177857681.pdf
    • http://sarhello.online/how_to_use_canon_t5iojjnc.pdf
    • https://cdn.sqhk.co/jolodovi/hjfgcjb/bubble_mania_game_download.pdf
    • http://save50.pro/new_jersey_residential_lease_applicationzxjq0.pdf
    • https://lepeposozul.weebly.com/uploads/1/3/5/3/135317560/dd0486ec.pdf
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/tatixaxekodajudepe.pdf
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/jegugoje.pdf
    • https://cdn.sqhk.co/dajebala/dghichc/56240276919.pdf
    • http://atomyimperial.ru/pexolkd1up.pdf
    • https://cdn.sqhk.co/karapenakozi/gjiibhw/black_horse_off_road_shark_running_boards.pdf
    • https://cdn.sqhk.co/dejuxafe/jjkgeMA/87239999213.pdf
    • http://vegofejolafud.mygamesonline.org/ziribijikolakove.pdf
    • https://cdn.sqhk.co/zowonefaso/hbCr2o8/56650452990.pdf
    • http://zigapajuxijado.mywebcommunity.org/sara_ataxia_outcome_measure.pdf
    • https://cdn.sqhk.co/tititafoza/bghhchc/100_hits_blues_rock.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_170965be587e4550b5f0acb2c3c94945.pdf?index=true
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_71c9e0411e3f4117a0a36d347390ae41.pdf?index=true
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_0564ecb33f544378b5581e7f1cc71c6e.pdf?index=true
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_99b613aef9b74d03beae6135f92003a0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79a.bin
1fe86dfa7717ec080ae0cb179fd300c7519dfb713c2c6c260bb323323fdf60ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 5212 bytes
font_01_sfnt_off0000f95a.bin
4f9cb31f33235ed431e454ab14d10f0dadddde61db36e8c7848887929596309d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 11972 bytes

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