Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ad41ca53a0e5ac…

MALICIOUS

PDF

83.5 KB Created: 2021-03-14 19:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a51efc037991e5f11cdd9377a5038b84 SHA-1: 68ee9376496f504ffc2f5ccd173ab3e080fd35e5 SHA-256: 83ad41ca53a0e5ac198364b827f2a550befee701f73a5202e022bf3277a96c72
156 Risk Score

Malware Insights

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

This PDF is classified as malicious and likely part of a phishing or SEO link farm campaign. It contains numerous external links, with one prominent URL being https://nipisod.ru/award?keyword=engineering+drawing+textbook+pdf+free+download+n2, suggesting a lure to download further malicious content. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, likely for SEO manipulation or to distribute malware. No scripts were extracted, but the PDF structure and link farm behavior point to a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nipisod.ru/award?keyword=engineering+drawing+textbook+pdf+free+download+n2
    • http://goodnaturak.space/jidozow6uvl6.pdf
    • https://cdn-cms.f-static.net/uploads/4482206/normal_600e988f0fa72.pdf
    • https://static.s123-cdn-static.com/uploads/4369185/normal_5ff5eb03acc61.pdf
    • https://cdn-cms.f-static.net/uploads/4451217/normal_5fdbd3f45b55b.pdf
    • http://interplast.ru/785124358868lcne.pdf
    • http://bazunujovi.scienceontheweb.net/25422474039.pdf
    • https://static.s123-cdn-static.com/uploads/4465388/normal_5ffa8a6a37fc9.pdf
    • https://cdn-cms.f-static.net/uploads/4421778/normal_5fd31993a5536.pdf
    • http://spainwow.pro/what_happens_when_your_kindle_fire_wont_turn_onl2rgq.pdf
    • https://cdn-cms.f-static.net/uploads/4485305/normal_603a81d3effd7.pdf
    • http://mifirejetevina.getenjoyment.net/54284323146.pdf
    • http://websporizle4.com/icloud_unlock_freenl9ge.pdf
    • http://natlab.ru/grbl_g-_code_motion_controldqh4s.pdf
    • https://cdn-cms.f-static.net/uploads/4479441/normal_601d7cea5a029.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://muzulozak.atwebpages.com/cirrhose_du_foie_cours.pdf
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_d85cabfb6acd4cee84a2d870ce0c9665.pdf?index=true
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_d0ddec7e18294fae9ae186e77568ba31.pdf?index=true
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_ec9a42803f684323b3b25a0e59b5e947.pdf?index=true
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_c7d59b65f7e144a6ba795e44f05766de.pdf?index=true
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_f34d90f58dcc4917bb104d30a53465e8.pdf?index=true
    • http://pelebirepopo.onlinewebshop.net/zokorabojijoxekadelelasu.pdf
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_8bca25fb789f437380753e5b3eef05c8.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_f9e83f756632489d8a63c13cebf38d5a.pdf?index=true
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_92a2ea324e5144deb7adc5c23cf6dfe6.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
    • http://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2eb.bin
212cb5c3ad2ef159f61f4015e6615964a69b37bd58c94a5107938283c216779c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 5484 bytes
font_01_sfnt_off0000f5b6.bin
4eb640e1f3fabda5edbf826275fd2b4fcf019bdef00b8e9104a7c9cd1fc42218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 5852 bytes
font_02_sfnt_off0001046d.bin
3fb5f2554537c442243f3338da7bb67ec56606182fc01b86bfc29df16746548b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 11124 bytes
font_03_sfnt_off00012a99.bin
8345d1cc2b6b461b856d0454e2cf67edf5851291b6d0ebf21a7da0c9813a2b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A99 16028 bytes

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