Malicious PDF — malware analysis report

Static analysis result for SHA-256 93de4c8c03e0734a…

MALICIOUS

PDF

72.2 KB Created: 2021-01-06 02:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c15a953cd552a001cb1a581f97cad44f SHA-1: c41b4708726b4531951400a8f061a7fd9ef682e7 SHA-256: 93de4c8c03e0734aa721e781b057751e2d0d415fdddb8698651f28fb41a5a185
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The embedded URL `https://trafffi.ru/aws?utm_term=facebook+banner+size+template+psd` indicates a potential lure related to graphic design templates, likely to disguise the malicious intent of redirecting users to other sites.

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://trafffi.ru/aws?utm_term=facebook+banner+size+template+psd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5fe5c420c1ac2.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/7391551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449014/normal_5fe25f049b956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5f9841cb308ff.pdfIn PDF document text
    • https://vadisasezex.weebly.com/uploads/1/3/1/1/131163908/debe3bcb4132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5f9839da7cde2.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/gc7gghg/90s_music_trivia_questions_and_answers_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/jdigdyX/duet_karaoke_songs_r_b.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/3181684.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/tadovudumiwebezi.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/bb427ecff126227.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/896baf50-0af2-4e45-b6bb-a2b13ed71358/c_2h2_ch4.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/ultimate_health_school_manassas.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/finaxarawebiwugel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/895d6fe2-184c-419a-840e-9cb0743a6ae8/what_kind_of_dog_is_scooby_doo.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_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 5428 bytes
SHA-256: 02f1c5e8cb268bf4a8b0cdc1e7d6b9f3138103130709874e674e5537d7c0f488
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10496 bytes
SHA-256: 597a9445af6a4a7aeb54a642e9fa60da4f9870321745705de83c35ab2245570e

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