Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a53c16ad0bd34a6…

MALICIOUS

PDF

74.0 KB Created: 2021-03-31 15:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0cd92ec6f6cba96c03905420e59d00fb SHA-1: decba039635304edbeade5faf59116427dbc411d SHA-256: 0a53c16ad0bd34a6caee9fbba2c5f8e13458d39a990ad54478b6020512cbcab0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/wix?keyword=guide+to+troubled+birds+quotes PDF link annotation
    • http://lobulezinovux.medianewsonline.com/concierto_de_aranjuez_guitar.pdfIn PDF document text
    • http://gelchlen.fun/hitchhikers_guide_to_the_galaxy_audiobook_downloadww0ub.pdfIn PDF document text
    • http://moneyindia.site/7401780362u7yww.pdfIn PDF document text
    • http://opendouche.xyz/hunter_ceiling_fan_remote_control_not_working6tlrh.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/fisoz_juximiziwivo_pirusif_desafatisewaw.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/45354060408.pdfIn PDF document text
    • https://zumekaxiligub.weebly.com/uploads/1/3/5/3/135385258/9757803.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/edada119-170a-467a-8751-f3807693b735/45098024621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b0e02a-bc15-4cf2-952f-5ee93f92d2cc/54745547218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e113e265-458c-4e56-bcd8-14ec2eb9eb8d/ashrae_handbook_1997_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4883af56-334d-4263-8a0f-bad59f6824e8/89959013873.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/belanjawan_kedah_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/mulberry_fork_wma_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98269ab6-9247-4e14-b624-16a3f6d3c38c/86392361634.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/vukinepolazonagidumoxelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc380b44-51a1-49e1-a66d-e0bd5c378f43/79228139885.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/steam_community_dota_2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 4908 bytes
SHA-256: cd3db1ca16110b706939a19f4ba7aa2aa83e9976e1d925a6e43a37bbdc22c06b
font_01_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 10432 bytes
SHA-256: 83046903673409ad794cffe321bdefba573dcf61f1a71ef6160934ae071f9a90

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