Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d92b08ef3e3604…

MALICIOUS

PDF

76.1 KB Created: 2021-02-28 03:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab2a79001c9293d1ae5f5d3b79d459d6 SHA-1: e1b7c714a31dd65f3d64b6495c0ad2c12ea52e3a SHA-256: 64d92b08ef3e3604d06b6888ba0957c7e1f31814a885c91e405e0df914475a59
136 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains multiple suspicious external URIs, with one specifically noted as an invisible link designed to lure users to a malicious domain. The presence of embedded URLs and the overall structure suggest this document is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/strik?utm_term=how+to+use+prismacolor+colored+pencils+for+beginners
    • https://cdn.sqhk.co/ropimipaf/nichhib/15741271551.pdf
    • https://cdn.sqhk.co/gimexigerub/58ibhfX/world_of_cubes_survival_craft_game.pdf
    • http://mishgen.com/figakodefibotovzqf1d.pdf
    • http://vk-settings-change.online/kajogasikidulos6v3y7.pdf
    • https://cdn-cms.f-static.net/uploads/4469638/normal_5fea2165b7c7e.pdf
    • http://art-practice.org/282774509883ijx7.pdf
    • http://laulu-go.ru/69705020163a4ab7.pdf
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/b3d5cc7.pdf
    • https://static.s123-cdn-static.com/uploads/4448116/normal_5fcbed62e65a2.pdf
    • https://woviwawegar.weebly.com/uploads/1/3/4/3/134319486/4225069.pdf
    • http://naturaleone.space/34798298458i2rog.pdf
    • https://cdn.sqhk.co/senogewuki/QdMihhb/3452926593.pdf
    • https://cdn-cms.f-static.net/uploads/4379471/normal_603280c971d03.pdf
    • http://instapriz.online/dulinom9uhlh.pdf
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/busutoniratukevawula.pdf
    • https://cdn-cms.f-static.net/uploads/4491432/normal_601d4bba086bb.pdf
    • https://cdn.sqhk.co/bojowagawire/giMhdtg/wood_block_puzzle_answers.pdf
    • http://kinokaiff.space/definicion_de_inteligencias_multiples_segun_howard_gardnerevjze.pdf
    • http://loginwithfb.site/brown_rice_vs_white_rice_nutritional_informationsoyo9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ea7f.bin
e0453862bcb482bf73674697490da121b4b5983eb5762aaf7ad59d43a541e5d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 5668 bytes
font_01_sfnt_off0000fdbc.bin
202bbc8a4d4f3c85c0d8a4e1b1baa56ac8cac0eef02424ccea0f7b7b2201a1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 10924 bytes

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