Malicious PDF — malware analysis report

Static analysis result for SHA-256 164dd9eada9c76f5…

MALICIOUS

PDF

77.9 KB Created: 2021-03-13 20:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bd98ae0b42f73144f3203e0285d4bf3b SHA-1: a3be4b34d0e107a727a542e51c531ad41e138556 SHA-256: 164dd9eada9c76f593dc8d9c84d80ad4d04443968702d82adf00e17ffcee1522
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics as malicious, including a critical finding for redirecting to known malicious infrastructure. It contains a large number of embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+cook+chicken+breast+in+power+cooker+plus In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_603ec8fd6e2f5.pdfIn PDF document text
    • http://sodahq.club/1997_club_car_repair_manual_free_download8p19r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502920/normal_6006bc62af979.pdfIn PDF document text
    • http://cg-designer.xyz/mojebefijepukelalesizilfn5hj.pdfIn PDF document text
    • http://ejinaya.com/wheel_building_bookxnfej.pdfIn PDF document text
    • http://getcabinets.xyz/fokobejalajodt5ihc.pdfIn PDF document text
    • http://getcreditcheck.info/86424423130hy6nd.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/88494431244odl8u.pdfIn PDF document text
    • http://fb-ig-violation.com/impossible_quiz_answers_level_72o8lkx.pdfIn PDF document text
    • http://bu-markett.com/the_paddison_program_for_rheumatoid_arthritis_reviewsmeg6u.pdfIn PDF document text
    • http://fb-ig-copyright.com/sector_14_gurgaon_markettfeyp.pdfIn PDF document text
    • http://opensalle.xyz/adobe_premiere_pro_cs5_download_free_windows_7ukqft.pdfIn PDF document text
    • http://cmbespaceclient.xyz/lovecraft_s_untold_stories_collector_s_edition_ps4vlbtk.pdfIn PDF document text
    • http://fresh-ita.fun/soap_ingredients_lyebp33s.pdfIn PDF document text
    • http://tesar-krd.ru/garmin_gns_430_user_manualbcriu.pdfIn PDF document text
    • http://nesobaka7.xyz/how_to_calculate_flow_area_of_pipe88tla.pdfIn PDF document text
    • http://whysmall.space/ecommerce_evolved_tanner_larssonqbtco.pdfIn PDF document text
    • http://axecheat8.xyz/ribopivalafa70yje.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/4a52f398-168d-41aa-8ff9-b301d1f76985/40_rules_of_love_shams_tabrizi_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349faa93-d40e-44b4-a7df-282e08b69cff/best_auto_repair_shops_near_me.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_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 5280 bytes
SHA-256: bce0804c9d48f86f22bd3fe83dd7c881d9d3619b6034ae4eaae2bead3cbec5d2
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10980 bytes
SHA-256: a5be853aa91c84ca9839eba690e129e3b54777ce3121ec8deb633981fda247cf

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