Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17fba5171efef34…

MALICIOUS

PDF

72.9 KB Created: 2021-06-05 09:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dc695cbddfd6f3e6a8225681ba057da SHA-1: 6735ea65baef4210fb2f7b50049e4931da3809d8 SHA-256: f17fba5171efef34818989457e9d5e16279922d633288ff9f372715af199ddbd
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'Korean grammar in use pdf download', likely to trick users into downloading a malicious payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/pbw?utm_term=korean+grammar+in+use+pdf+download
    • https://fifubinagate.weebly.com/uploads/1/3/4/8/134854053/abcc03d77058.pdf
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/nozixerib.pdf
    • https://cdn-cms.f-static.net/uploads/4403679/normal_6054a986f2686.pdf
    • https://cdn-cms.f-static.net/uploads/4370074/normal_6023bd6937679.pdf
    • https://cdn-cms.f-static.net/uploads/4402000/normal_605408e55ea6b.pdf
    • https://cdn-cms.f-static.net/uploads/4481409/normal_605c93b5bc6fb.pdf
    • https://loxufezikuwudi.weebly.com/uploads/1/3/4/6/134687227/36cdff7c.pdf
    • https://cdn-cms.f-static.net/uploads/4424024/normal_601a6554965d2.pdf
    • https://static.s123-cdn-static.com/uploads/4483867/normal_5ff1b8761636b.pdf
    • https://cdn-cms.f-static.net/uploads/4387035/normal_600fabe6c81e7.pdf
    • https://cdn-cms.f-static.net/uploads/4366957/normal_604702601b316.pdf
    • https://cdn-cms.f-static.net/uploads/4370097/normal_6051c517310c7.pdf
    • https://cdn-cms.f-static.net/uploads/4405925/normal_60332a10f2063.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://junerew.pbworks.com/f/besofepasopubutamifuro.pdf
    • https://uploads.strikinglycdn.com/files/f1cec7e0-7487-4246-b2b8-d2e3159fbb6b/how_to_write_an_employment_verification_letter.pdf
    • http://nikekuva.pbworks.com/f/cells_and_their_organelles_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/ee979d46-bb6b-4146-a689-a68fe296c916/72431484741.pdf
    • http://zizovitunex.pbworks.com/w/file/fetch/144488124/xazagatelun.pdf
    • http://ziriwuru.pbworks.com/w/file/fetch/144498225/how_to_use_motorola_cp200d.pdf
    • http://xibosini.pbworks.com/f/free_24_hour_schedule_template.pdf
    • https://uploads.strikinglycdn.com/files/68699bb5-68d1-4a96-a48a-94393d91eeb5/fire_and_ice_movie_animated.pdf
    • http://garifukedako.pbworks.com/w/file/fetch/144426786/how_long_does_a_piercing_take_to_heal_nose.pdf
    • http://ziriwuru.pbworks.com/w/file/fetch/144484686/how_to_put_up_baby_trend_pack_and_play.pdf
    • https://uploads.strikinglycdn.com/files/ea0f74ec-d0c2-4117-9e79-c66236a620fa/what_is_a_180_angle.pdf
    • https://uploads.strikinglycdn.com/files/77692b2e-7522-4c42-a9af-1139cd7d6c75/how_to_lose_weight_well_rice_diet_plans_2019.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_off0000de5c.bin
50111cbcb9889b00ec54b34e0ded5fddd2504b1b0a1bb2bcc62827c7ab9b8d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 5424 bytes
font_01_sfnt_off0000f0d1.bin
49b207457d419c661f4a498ffa82071e81073194b0a70ee907edb8e4c29ce36d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 10836 bytes

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