Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f78cf366375e5a…

MALICIOUS

PDF

70.2 KB Created: 2021-03-19 15:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0468583fd51f3a6cda108ecbd1a36f2 SHA-1: 72ede70eb1d017353ca6e4bf5b64dbb47955196a SHA-256: 90f78cf366375e5a3b44db7ee5292df7698050b76b5e4eba8527c255d4e20dd9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm, suggests an attempt to manipulate search engine results or redirect users to malicious sites. The document's content, though heavily obfuscated, appears to be a lure related to downloading a PDF, likely a phishing or scam tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=descargar+amazing+fantasy+15+espa%25C3%25B1ol+pdf
    • https://dogodomob.weebly.com/uploads/1/3/4/0/134017369/4657953.pdf
    • https://kebokezuzak.weebly.com/uploads/1/3/5/3/135318209/47d76704ff.pdf
    • https://solekavugixe.weebly.com/uploads/1/3/3/9/133999951/374663.pdf
    • https://cdn-cms.f-static.net/uploads/4426549/normal_6019c751dbf9c.pdf
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/mukilemage.pdf
    • http://kvyovk.xyz/54127437010838ok.pdf
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/zunetopoku.pdf
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/daxibogonemu_magomunukule_dovatigig.pdf
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/fasipuwoxuwiva-gizebepupewa.pdf
    • http://begemot.space/21792805150u5zn8.pdf
    • https://cdn-cms.f-static.net/uploads/4407552/normal_602493a0b4bb0.pdf
    • http://ionatr.space/26085695507olw0x.pdf
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/1a273cffae6.pdf
    • https://kasoguwetapita.weebly.com/uploads/1/3/5/3/135305743/7838020.pdf
    • https://didowaxa.weebly.com/uploads/1/3/4/3/134387091/wexepunami.pdf
    • https://zazozoke.weebly.com/uploads/1/3/0/7/130776388/vibija_muxuteloralo.pdf
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/venedapenepisoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_1e9ecbe8432040058ad83810c589807a.pdf?index=true
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_3a62fcedbc7e45a39fd6ff419438802e.pdf?index=true
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_cae69a00e4784785b83298534c33e370.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc5.bin
16143e789db3f5ed4b54d83ca760886ab2bda2865b4074380455ada2b3c06ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC5 6012 bytes
font_01_sfnt_off0000e10d.bin
816f8d86d736307753de36dbed07ffb5b1eeb8d40c9703936133444911373410		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 12572 bytes

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