Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3e7d6a8900caec…

MALICIOUS

PDF

66.7 KB Created: 2021-06-09 14:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8fb68e206cee12ee68d876cc8b18900 SHA-1: d252af26458e58cc0fd1c3e759f4a9109e5cf597 SHA-256: dc3e7d6a8900caece7d211fe3d6445e21f7c54d345ded829f1096437318675d9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified a significant number of external links, suggesting a link farm or SEO abuse tactic. The embedded URLs point to various PDF files, some of which are confirmed benign, but the overall pattern indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/pbw?utm_term=banjara+hit+songs+mp3
    • https://static.s123-cdn-static.com/uploads/4380393/normal_5ff4a61892533.pdf
    • https://static.s123-cdn-static.com/uploads/4459935/normal_60012ad9d9d92.pdf
    • https://sazigusejif.weebly.com/uploads/1/3/4/7/134771803/fogoviwemik_kaselusefol_buxun_runigenadi.pdf
    • https://cdn-cms.f-static.net/uploads/4383918/normal_5fda645b26412.pdf
    • https://bukojawuwo.weebly.com/uploads/1/3/4/5/134508808/6063827.pdf
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/6b157b8bb4.pdf
    • https://kudojiluro.weebly.com/uploads/1/3/4/4/134441165/ec72dff470eb.pdf
    • https://static.s123-cdn-static.com/uploads/4448345/normal_5fec1ca477ac6.pdf
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/626384.pdf
    • https://govalusazun.weebly.com/uploads/1/3/5/3/135325024/0cf0fe303d1.pdf
    • https://cdn-cms.f-static.net/uploads/4418385/normal_60596728c70d1.pdf
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/bidipisomudar.pdf
    • https://delidanazej.weebly.com/uploads/1/3/2/6/132681463/sivikop.pdf
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fcf598434c3a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/842f05f2-bed9-475f-bd35-fc265d2fd599/rivolisamarijomomobipenam.pdf
    • https://uploads.strikinglycdn.com/files/374d7d62-49a8-416e-9230-037586412ef8/how_to_adjust_screen_on_peloton_bike.pdf
    • https://uploads.strikinglycdn.com/files/faa181f3-c4d7-4247-9b3d-c7cef39112f0/pixelixowebagiwezefu.pdf
    • https://uploads.strikinglycdn.com/files/658d3d4a-47d3-4fba-9c72-fdf427649d9c/2006_bmw_330i_blower_motor_resistor_replacement.pdf
    • http://rukutuxeriro.pbworks.com/f/french_er_verb_practice_worksheet.pdf
    • http://xidesux.pbworks.com/f/sobexikowoboposifasiju.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_off0000ca55.bin
0cafef5bf56d85d898fb1835d876e9b099e2c85169b16f148c691a24ef2fe19e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 5488 bytes
font_01_sfnt_off0000dce2.bin
a706ec9539853c2d50e1e9c433c7e2baaab1bb00ee485c43fb478522d702ba26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 9868 bytes

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