Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec95bb6dc3c3cbf…

MALICIOUS

PDF

75.4 KB Created: 2021-03-12 12:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9510b0976f50411a258a25d2a1b731d4 SHA-1: 20b5714be8348a9b4cca051ce7e6fabaaf6381c8 SHA-256: bec95bb6dc3c3cbf455ee0f5a95c2d0659414936899289f105ebd26101fb4a6c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to search terms, further supporting the link farm hypothesis. The presence of embedded URLs and the nature of the heuristics suggest it may be used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://golowaki.ru/123?utm_term=rose+flowers+bouquet+pictures+free PDF link annotation
    • https://mawobomogagot.weebly.com/uploads/1/3/4/1/134109187/jexozipu-dubikefuxebene.pdfIn PDF document text
    • http://24goodstore.site/washington_dc_covid_vaccine_registrationm88ix.pdfIn PDF document text
    • https://dozadekexojigig.weebly.com/uploads/1/3/4/0/134096874/d49cddf245f.pdfIn PDF document text
    • https://dilopapavi.weebly.com/uploads/1/3/4/7/134705518/bebixewuwo.pdfIn PDF document text
    • http://reactivaperu-2020.com/gujepolinotidivefizp54cp.pdfIn PDF document text
    • https://navemozozaju.weebly.com/uploads/1/3/1/1/131164567/ditibixixezoto_wagupig_folixezasaxepe_foguzamijab.pdfIn PDF document text
    • https://sufotope.weebly.com/uploads/1/3/0/7/130775917/5bec6fe3.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/1116391.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/2220858.pdfIn PDF document text
    • http://nosinoski.shop/bagamopemojodelazojwa9iw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_6568d6b299c64c33b08bb987d9371e63.pdf?index=trueIn PDF document text
    • http://dukazel.rf.gd/future_perfect_continuous_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c796138-2138-4374-96a9-0b65d8ec876d/emperor_clock_451_050h_manual.pdfIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_991a1798294346f783b1a95528e99afe.pdf?index=trueIn PDF document text
    • http://dogamesesokuj.rf.gd/fewuwabejumujupif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791b6321-ddbc-45b8-8e9b-1f88b45c00ef/attack_on_titan_season_3_part_2_episode_4_countdown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146e2f47-adaf-45c3-b033-fa3b10ee1c07/vw_golf_mk3_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629deb78-8a16-45cf-955f-d86332b1c0ab/tonukipele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3d658a-1a9e-46be-ba44-d1c37a4772be/22089469413.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_d5e87ef8df324632b27bb560374fc0b2.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_f62cb40d05af4d4696b65ccadaa8ac6d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 5164 bytes
SHA-256: 7fd1362b279dd148fc24f0b0e81731cf8a095d72601bf7810d55307a95a1a839
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 11112 bytes
SHA-256: 18fc50487df028abd00f27b04aeba6f92e6e7aa4cb12824dba85921d531760b4

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