Malicious PDF — malware analysis report

Static analysis result for SHA-256 931ae1a99309cdcc…

MALICIOUS

PDF

75.8 KB Created: 2021-03-19 05:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bea4dda36c186cbff9abc9761b8b0523 SHA-1: 11cbdebd1caeecdd6add2b2ac4ca5ac5cf3d5243 SHA-256: 931ae1a99309cdcca4befa16ef4132189b84057d5b079044abb6a75b22045e0d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/wix?keyword=beaulo+sensitivity+on+console PDF link annotation
    • https://cdn.sqhk.co/pojuwudedi/geu330v/general_knowledge_quizzes_for_students.pdfIn PDF document text
    • http://ipoteka.net/getulenijaguw09hmf.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/gg1ijnw/superhero_car_racing_toon_robot_car_transformer.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/Zigcgjf/merge_magic_cheats_challenge_16.pdfIn PDF document text
    • https://cdn.sqhk.co/nivopekodi/jfhhypo/pee_wee_herman_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/heggGgh/marketing_plan_format_sample.pdfIn PDF document text
    • http://shoop-fp.ru/fakaduresapevekeagw1n.pdfIn PDF document text
    • https://cdn.sqhk.co/voduzetefir/jdifygj/rosit.pdfIn PDF document text
    • http://coins24h.com/26438375750slyh0.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/jddjcii/6222437122.pdfIn PDF document text
    • https://cdn.sqhk.co/sonawumi/zgj4nQr/nice_guidelines_pulmonary_arterial_hypertension.pdfIn PDF document text
    • http://spacexfoundation.net/how_to_set_up_your_orbit_sprinkler_system9gy40.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/zonebon/bandicam_gratis_full.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/76838591200.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_040d863c471048d3ad5823c19f08525a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/78106657457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c270d3fd-8207-4c39-a570-6f7e2a28887d/salton_ym9_yogurt_maker_directions.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_4f8fde710de746c1b378bc44f8e89272.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8172b8fc-6d8e-4ac4-9628-9a5713cf3245/8741108609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8670eddd-43b6-42a3-a449-ed88931ea29c/common_nouns_exercises_for_class_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468c6461-2ad0-4ee6-ac92-07dc21484c46/alesis_dm10_snare_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/72664603320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1815d026-a909-4e83-a828-17ee0bf26c83/71055028805.pdfIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_31bf332d92e2436cb135c90f8cb1f3da.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_a4098f930e7943cd8676bfaf79f259c7.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 4908 bytes
SHA-256: d80581a2cca0b85f6c1cccaadd7a6c9659a2a7de86a44fc352987ef0c384e6da
font_01_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 10620 bytes
SHA-256: a08e673a66ab1aef5a7787e94b53af7e87b71edd69fbc3008401eda8248dffdb
font_02_sfnt_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc

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