Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b36a76df2a26c2…

MALICIOUS

PDF

81.3 KB Created: 2021-04-13 10:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5eaeff789cf03c51d847b4c3c549efa SHA-1: 239d7422ebce0b67926806b4d06938a9f10a4016 SHA-256: 12b36a76df2a26c2a0cf3aab006523ea80a4eb61138c443f21209ec0e7f16604
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=upwards+basketball+coach+app
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_beee4fdfdf34458d9fde0718f801de63.pdf?index=true
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_1aec98befa4c4b4293506e5f4f8a83a1.pdf?index=true
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_45329c057946411283f8da32c74b7f0b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23cc27cc-5f2c-49bd-89d1-e16ed1a30b02/how_to_use_a_food_processor_black_and_decker.pdf
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_2d0f1d80a9df4c728c1bf8af3fd0ebc1.pdf?index=true
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_b297cfc8fd714e829df7b7710927ac1a.pdf?index=true
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_a73e9fef96b340948875c106e4c1e664.pdf?index=true
    • https://uploads.strikinglycdn.com/files/97eb2f82-c820-42a4-86c9-a4a2f2d8ec12/volkswagen_car_repair_near_me.pdf
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_88e34987bcca41ee8f8111abe9dace1e.pdf?index=true
    • https://s3.amazonaws.com/lopadivupudexa/behavioral_interview_questions_for_managers.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_821421a3bd0e497985d0bc6e20e02791.pdf?index=true
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_6acf863b1b5f47faa83a7592754379dc.pdf?index=true
    • https://s3.amazonaws.com/wowonesoribu/how_many_calories_are_in_a_sonic_strawberry_slush.pdf
    • https://s3.amazonaws.com/dabatisew/text_font_bold_in_android.pdf
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_a8d8454f03394aa89055833105a270db.pdf?index=true
    • https://03a45e23-20c9-4b13-8d21-50c2609e56df.filesusr.com/ugd/502f3d_df2498aefd6e411f8c799983b2ef5916.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e803.bin
1a8e470b6d77d8bf7936683d5217f8b3ad74db7966c7a046ca1cab2ebe4eb7b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 5448 bytes
font_01_sfnt_off0000fa97.bin
eeb28c77df3c089e1f1e7bd31a08efe01cc930f7fe89f2fc3818356262358555		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 11360 bytes
font_02_sfnt_off0001216c.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16204 bytes

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