Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3208c5620d1f015…

MALICIOUS

PDF

69.1 KB Created: 2021-03-12 17:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbe28ffae2947925f3efb3e05707b933 SHA-1: 4318c3fe661c04675a2d9bbddc0d1e9c174f33c7 SHA-256: a3208c5620d1f0153b25979adba7ae5b684f9e7ca0c3bcbd09fc2956415fd436
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The document body, though partially corrupted, references a 'test scribd' which likely serves as a lure to direct users to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=los+5+lenguajes+del+amor+test+scribd
    • http://all-gopro.com/xilazizenolojowatagolobiwl40n.pdf
    • http://creditscoretracking.info/jakiw0vpup.pdf
    • https://berovifis.weebly.com/uploads/1/3/4/7/134730871/rukiwanexunubu.pdf
    • http://onsideball.info/defining_and_non_defining_relative_clauses_worksheets_with_answers4m9vl.pdf
    • https://wedufejaf.weebly.com/uploads/1/3/4/0/134018106/380a23.pdf
    • https://dijodiruji.weebly.com/uploads/1/3/4/0/134097483/fuxofipi-salapu-katojojenitus.pdf
    • https://cdn.sqhk.co/nisikevepoxi/aL6hcVa/pixel_4_force_restart.pdf
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/e87738a19de3b.pdf
    • https://lurusavi.weebly.com/uploads/1/3/2/7/132710630/gepiziwe.pdf
    • https://juvedolukojubis.weebly.com/uploads/1/3/2/6/132682904/81110.pdf
    • https://cdn.sqhk.co/wojusipi/iijcgfx/farilelegifujozijeje.pdf
    • https://cdn.sqhk.co/fipufose/YfRggha/gerojewosiliwekudepesuja.pdf
    • https://nogeduju.weebly.com/uploads/1/3/1/3/131398368/8030449.pdf
    • https://xomugewobi.weebly.com/uploads/1/3/0/8/130814749/48ff52fa6344b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/57bcd1cb-9a48-4e4a-98e5-c1f34d3625f0/how_to_replace_kitchenaid_oven_control_panel.pdf
    • https://s3.amazonaws.com/fowikorejodi/excell_pressure_washer_2600_psi_parts.pdf
    • https://uploads.strikinglycdn.com/files/19318198-4641-4d06-8ecf-c0d5bf7e3efd/lazojiburoneluzokinabi.pdf
    • https://uploads.strikinglycdn.com/files/297f0d4a-e92f-4f72-b34c-755696824983/94327245412.pdf
    • https://uploads.strikinglycdn.com/files/a30e6211-c1ea-42d6-ac06-4dd02078b84d/how_to_use_a_vicks_vapor_inhaler.pdf
    • https://s3.amazonaws.com/garorowa/motorbike_games_apps.pdf
    • https://uploads.strikinglycdn.com/files/bcf71da9-3112-44d2-bc2b-d79703530908/kuvopagog.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b6.bin
c53f430a678591e769262c7a2e054ab01dbc91310f46bf6d5cf1f6605c39a76f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 5540 bytes
font_01_sfnt_off0000e380.bin
79a7870f527437df64d44be5f7da521dcb2572e51537e17b86e2bb14a44bca87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 10132 bytes

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