Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21b7ed9a6032286…

MALICIOUS

PDF

81.3 KB Created: 2021-05-10 16:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e4a2daa4ce2d298bdbf99e8ee6efa301 SHA-1: 60bff2dbef8dafeff67b3e59240703611c48d2e7 SHA-256: d21b7ed9a603228616adecddf589be1e56f8c29edb12f9bcbcc0ac36cde621e7
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The primary malicious URL identified is fokemale.ru, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=philosophy+bachelor+of+science+degree+in+sports+analytics PDF link annotation
    • https://cdn.sqhk.co/geruxibab/jESFggh/free_message_tones_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/rokogikapo/Ehiejbo/62313176425.pdfIn PDF document text
    • http://wordsideget.top/how_to_connect_ihip_headphoneswi7s2.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/gjHojc8/free_video_chat_apps_for_android_and_iphone.pdfIn PDF document text
    • http://mangalvpodarok.ru/72770920262ppeu4.pdfIn PDF document text
    • http://dfwshootersupply.com/transformers_6_bumblebee_full_movie_2018_englishp6y8b.pdfIn PDF document text
    • https://cdn.sqhk.co/fetesulatol/dIjeV3M/airpods_android_features.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/chrome_browser_apk_latest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9c56ae-10c0-48a8-805a-6c59e92cd90d/negative_binomial_regression_assumptions.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_128a8970fca04226855003efaaff76ed.pdf?index=trueIn PDF document text
    • https://dcaf3b11-26f0-4e60-b842-01857b8e1462.filesusr.com/ugd/2df88f_1edd915a840a425882605f3a17bcf7f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/157a4178-f842-481f-8812-88a4ea952eb9/24709769656.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_dcec4157496f425aaf06991d408c6847.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0bacbd2-ad74-4bb3-824e-4330578abaa0/healthrider_treadmill_ratings.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/vidmate_hd_er_apk.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_e117e27f86284d21aa8fea3606035ba8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/58001218371.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_cb2a1587cc8d4115a65e61687ce2cf2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb3cf75-540a-4784-b665-bebf1b4c27bb/69427787657.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_872d72f969b34c34b2f38ec874584170.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_ce136c98553846e59085a734148fcc65.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 5660 bytes
SHA-256: bf4257c4676972d110a396c74a16b25fa25cd5e1b8df3ae711cc5e08d3de7656
font_01_sfnt_off000112b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 10624 bytes
SHA-256: 8d85e400f0c4f39d53bc686f45757b5c394186e395cf2e4b10531d22b282310c