Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efd792e0a6a6716…

MALICIOUS

PDF

70.1 KB Created: 2021-01-16 07:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c66f685966442decd7eef0913aa0579c SHA-1: 85c961b5ce170a66160b195662cbcc93a4939df3 SHA-256: 5efd792e0a6a671620d11305a854c5aac801a99efd155dd4fa4c12967eb4de51
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to external sites. No scripts were extracted, but the overall structure and URL distribution point to a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/123?utm_term=coffee+shop+franchises+in+south+africa PDF link annotation
    • https://site-1194102.mozfiles.com/files/1194102/mental_health_first_aid_canada_manual.pdfIn PDF document text
    • https://site-1199955.mozfiles.com/files/1199955/ruvupozupekan.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/Fijib2T/84031153774.pdfIn PDF document text
    • https://punopofogow.weebly.com/uploads/1/3/1/4/131437229/f7f1d80904552df.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/jjij3gO/achikaps_pro_1._21dl.pdfIn PDF document text
    • https://site-1222001.mozfiles.com/files/1222001/balancing_chemical_equations_worksheet_110_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5f98f209beb46.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/flipkart_customer_care_phone_number.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/xezonijida/45023800959.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/xibapewalapoturipax.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/t-fal_ultimate_ez_clean_deep_fryer_owners_manual.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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 4976 bytes
SHA-256: 8535e187d64593c4463b6d8c104a0208b3939a75f1cc85de2722e99c85c980f4
font_01_sfnt_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 10516 bytes
SHA-256: a723170281b18362657b2bb5f2184227e1db6fd118a8244599650bdf49e29374

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