Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9a312a36e54864…

MALICIOUS

PDF

67.8 KB Created: 2021-03-12 09:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3c30e2f4f397378a36f66c273cdeaa73 SHA-1: a9338d248fc10ff63c9ac3afa11b1803b51121b9 SHA-256: 1d9a312a36e54864fc45a71a1f552a6595d9a8cd5a4dee1aabcfe3322a3ea5b7
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely hosts malicious content. It contains a large number of embedded URLs, many pointing to disposable hosting or redirector infrastructure, suggesting a link farm designed to direct users to potentially harmful sites. The presence of 'utm_term' parameters in some URLs further suggests a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=netgear+7550+modem+lights In PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/flq9ZRf/android_change_lock_screen_password.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_5fd9968203480.pdfIn PDF document text
    • https://zijedizadof.weebly.com/uploads/1/3/4/6/134692085/vudanegorujoxexujol.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/gjicbgi/fuzagotukelas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5fdda00b38737.pdfIn PDF document text
    • https://cdn.sqhk.co/gonuromabime/r1Qjh47/67826541452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_602962e119c40.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/3321521.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/0hgYjjc/brick_hospital_directions.pdfIn PDF document text
    • http://wosuxetomokife.22web.org/rancilio_silvia_v6_vs_v5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470975/normal_602f30a300c94.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/rumusakufazazigamuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_603a196b1c8cc.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/5c110ca2-c351-4fa4-b20d-15ddaaa88a62/78415181299.pdfIn PDF document text
    • http://bepinodobax.rf.gd/where_was_the_day_of_the_outlaw_filmed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abaefdf7-7ccf-4ab6-b583-7efb10961ee7/how_old_do_you_have_to_be_to_be_a_referee_for_soccer.pdfIn PDF document text
    • http://katewamopexo.rf.gd/viva_video_maker_apk.pdfIn PDF document text
    • http://kesexawes.rf.gd/what_is_the_purpose_of_an_aide_memoire_in_research.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_off0000cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 5552 bytes
SHA-256: bda92bb7bc9035816ef63e37e02cdcef158000b0993fa45cd2c787598f5c1c68
font_01_sfnt_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 10196 bytes
SHA-256: 1f82a2db5780feff925b26838ee0e6fe0ae58e2258d11662d6449c6b8e4b1bfc

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