Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b616b08e41fa23…

MALICIOUS

PDF

108.3 KB Created: 2021-05-14 14:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 16dde168162a9b20437cfe45dd8bca20 SHA-1: 2042dba5365fcd01a663c278d3352c799718e0db SHA-256: f2b616b08e41fa23ed0ac9b26eccbf1dc96e9ab077ba8c039f0689761ec50405
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm designed to redirect users to external sites, with one prominent URL being https://golowaki.ru/strik. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text related to a movie search query, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/strik?utm_term=did+they+take+wolf+of+wall+street+off+netflix PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368741/normal_601be19a3e5e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_6038774d37af1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_60260c7d61cb9.pdfIn PDF document text
    • http://mpvideo.org/what_are_the_rhetorical_features_of_the_bill_of_rights51dpq.pdfIn PDF document text
    • http://finansi-7.online/861353983663xbbl.pdfIn PDF document text
    • http://small-italy.space/seventh_day_adventist_sermons_outlines756tn.pdfIn PDF document text
    • http://tramlaweq.online/keurig_2.0_k450_single_serve_brewernvyvw.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/zikevewuxosemeeab.pdfIn PDF document text
    • http://daniele.store/polijonujit5mfp.pdfIn PDF document text
    • http://duplicwcnj.space/read_candy_apple_books_online_for_freesmi6e.pdfIn PDF document text
    • http://shop-kid-toys.online/54046609676p5vxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_603bb1bbd8d38.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/87787198-a524-4628-89f5-8b3ee4abbd57/9113870815.pdfIn PDF document text
    • http://woxariwete.rf.gd/fogupikazakijagawexorago.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_27db6474edd84a2bba8c6578595b12c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ed4c1a-4579-4c74-a9d2-2002decbc928/43192767567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a94954-45a6-49a1-b678-d49ab5612ea2/adobe_premiere_pro_cs6_free_download_windows_7.pdfIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_24522cf56af04df9afb593787d875214.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_6556374f7b3b46398b52b5e2df66e7da.pdf?index=trueIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_1a14dd934d7a4f968348cc7629327dbb.pdf?index=trueIn PDF document text
    • http://furaxem.rf.gd/mefedim.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_off00016772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16772 5320 bytes
SHA-256: e5b7321e44b1a2c8f7425aedc409b01b80089b063d41b040e38999c647e485a7
font_01_sfnt_off000179ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179AB 12136 bytes
SHA-256: 25d4b6b8fcd6421a1c7d2c9192b89fa1e208e62733da00c6630f13dfe4206dce

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