Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd20b5efe10ec30…

MALICIOUS

PDF

79.5 KB Created: 2021-04-07 18:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8da96c96d57e508ad5f37304e647a0d6 SHA-1: 62aa1245f4f09ad2622794cafc59886df92830a4 SHA-256: bcd20b5efe10ec30442e88fc1378383a5e731f1e5ef95cab48081527d0391555
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or distribution mechanism for further malicious content. The presence of embedded URLs and the overall structure point towards a phishing or content-luring attack.

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-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://maypoin.ru/wix?keyword=west+bend+kwik+drip+coffee+maker+manual
    • https://cdn-cms.f-static.net/uploads/4487626/normal_6024f58caa92b.pdf
    • https://cdn.sqhk.co/dugelabomaw/ewSDhjH/world_championship_cycling_2019_sportive.pdf
    • http://soinjaga.ru/jizopoxas670ip.pdf
    • http://nature-ital.space/32173247302306oq.pdf
    • https://cdn.sqhk.co/rapovixovuti/O6u1ihn/penugeba.pdf
    • https://cdn-cms.f-static.net/uploads/4493917/normal_5fd79f6dcd7f9.pdf
    • http://xajabuzowa.scienceontheweb.net/intermittent_fasting_diet_meal_plan.pdf
    • https://cdn.sqhk.co/tuseliwi/sjahj3X/allegiant_air_phone_number_busy_signal.pdf
    • http://ndfnasg.xyz/febrile_seizure_review_articleknnlq.pdf
    • https://cdn-cms.f-static.net/uploads/4489593/normal_604b26ca22569.pdf
    • http://jukejed.mypressonline.com/libro_alimenta_tu_cerebro_gratis.pdf
    • https://cdn.sqhk.co/xexemanidadu/e6gdghR/pulabi.pdf
    • http://bibivire.mygamesonline.org/furiwodirodamozazuxated.pdf
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/wovetizunususozame.pdf
    • http://xilibinebosapeg.mywebcommunity.org/inorganic_chemistry_notes_free_download_in_sinhala.pdf
    • https://ditezuni.weebly.com/uploads/1/3/5/3/135350757/3a0d7075f.pdf
    • https://cdn.sqhk.co/ketiwuvogi/Gjihjgd/mutants_genetic_gladiators_breeding_guide_goliath.pdf
    • http://sokegex.mywebcommunity.org/behringer_europower_pmp2000d_2_000w_14-channel_powered_mixer_with_multi-fx_processor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rupesujutiwu.myartsonline.com/lifej.pdf
    • http://bujekotu.atwebpages.com/childrens_yale_brown_obsessive_compulsive_scale_symptom_checklist.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd5.bin
ca6496f872c32f08e8a5612c96fff0ed42c02448938a681fa72fbf0b1a678b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 5492 bytes
font_01_sfnt_off0000fe6e.bin
01e519d440f0fa2ff59786af18858bd2155e12c844e1607e4649bda970089efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 10608 bytes
font_02_sfnt_off0001225b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 4324 bytes

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