Malicious PDF — malware analysis report

Static analysis result for SHA-256 b696e4487ecb4766…

MALICIOUS

PDF

81.7 KB Created: 2021-03-28 17:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a4bb4966efd3d9b6fca81e442300734 SHA-1: 76f4fb9ff2cbcb8b171f47dc2accead935996a20 SHA-256: b696e4487ecb47660a7a6d4c43f1c7e104ff642fefed452cb3049ce3ec5d6be8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains a large number of external links, many pointing to PDF files, suggesting an attempt to manipulate search engine results or direct users to malicious content. The embedded URLs and the PDF structure strongly indicate a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/strik?utm_term=why+is+model+y+more+expensive+than+model+3
    • https://static.s123-cdn-static.com/uploads/4372361/normal_5fe49343ad7d0.pdf
    • http://gagarinski.su/8146661938079y51.pdf
    • https://cdn-cms.f-static.net/uploads/4474985/normal_604d2e4782fec.pdf
    • https://cdn-cms.f-static.net/uploads/4402503/normal_604ce1bbee046.pdf
    • http://zahlungsservice-ch.site/the_witcher_book_series_goodreadsgmmq8.pdf
    • https://texupofomisuz.weebly.com/uploads/1/3/4/2/134235579/3915666.pdf
    • http://national-verifyteam.com/drifting_games_for_ps4_freev9r6x.pdf
    • http://dsv-trening.ru/56646787731023fd.pdf
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/6334644.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://leqqurint.online/i_10_traffic_report_near_me8fzvq.pdf
    • https://naxovemunozi.weebly.com/uploads/1/3/5/9/135958864/bc92b0f37a.pdf
    • http://pe50off.info/what_is_the_average_price_for_logo_design25ett.pdf
    • https://cdn-cms.f-static.net/uploads/4426263/normal_605f1be30bd04.pdf
    • https://cdn-cms.f-static.net/uploads/4463808/normal_6060898e24804.pdf
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/303812.pdf
    • https://dudasajaje.weebly.com/uploads/1/3/4/3/134362454/94e39f06.pdf
    • https://cdn-cms.f-static.net/uploads/4473618/normal_602039502a50e.pdf
    • https://cdn-cms.f-static.net/uploads/4454678/normal_60186a272730c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e69034d5-01df-4c13-a6be-d4f6a57cdc8b/bimulef.pdf
    • https://uploads.strikinglycdn.com/files/0a343bf8-a78a-4aac-abb6-394e5ece0074/cant_connect_to_my_cloud_dashboard.pdf
    • https://uploads.strikinglycdn.com/files/bd5f0d2b-813b-45f6-b001-a54d68986f8d/can_sunsetter_awnings_be_roof_mounted.pdf
    • https://uploads.strikinglycdn.com/files/d16e0b25-0b47-4e17-ba0b-4114cf7ff7a1/what_is_a_literature_review_example_for_psychology.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15f.bin
4248a635fe1a1e37f23b185def6df050f46af572f5f85f71f997061aa8e3534e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 5396 bytes
font_01_sfnt_off000103a1.bin
46def278a3906d805b0a0616a613424baf3f5a0aff38c759a1b2ca776c3e7c7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 11080 bytes
font_02_sfnt_off00012910.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 4324 bytes