Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe41436dd68a3bd3…

MALICIOUS

PDF

79.1 KB Created: 2021-03-29 14:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16931333d82b54bea3b92199f65de131 SHA-1: 0051de5ffb9bedb01397dead97fc1eac190f50a3 SHA-256: fe41436dd68a3bd3ea3c99afe141e809befa276a09464f72aeed76ce903b8bfc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly hosted PDFs, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or a trojan delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=5+stages+of+creative+development
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/lelumunegipap.pdf
    • https://cdn-cms.f-static.net/uploads/4401972/normal_600d263904a00.pdf
    • https://nenusisuma.weebly.com/uploads/1/3/1/6/131606583/684843.pdf
    • https://kurevewadojig.weebly.com/uploads/1/3/1/4/131437207/4541239.pdf
    • http://lamejix.scienceontheweb.net/rareborupe.pdf
    • https://cdn-cms.f-static.net/uploads/4392453/normal_6016abf33242f.pdf
    • https://zuzatalo.weebly.com/uploads/1/3/4/3/134326893/3418e8319082.pdf
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/4499771.pdf
    • http://xulubapatoso.scienceontheweb.net/56703022625.pdf
    • https://laganavixafalos.weebly.com/uploads/1/3/5/3/135341912/jaxewudenevete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_da42c8807232489d9765187d713e0347.pdf?index=true
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_ff949c5d4e2f43798141ec81181da854.pdf?index=true
    • http://madepadejatutof.onlinewebshop.net/xosilimola.pdf
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_040cd97b87274c9c99c7d30d7be5f7bd.pdf?index=true
    • http://nedizilunok.myartsonline.com/the_big_carrot_story.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_5949ff67fab84011ac6ea9d6f5a90d1f.pdf?index=true
    • http://tosijikis.onlinewebshop.net/angular_5_free_download.pdf
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_9ebedd477bea42598a3028456738f6ed.pdf?index=true
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_10802ff45c864b61a3bd51019786a705.pdf?index=true
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_13914f7dfbfc438dbec38be81adbb83c.pdf?index=true
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_7f0498a81a144db194ce209444fe398d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e82a.bin
3ba30e9235312a2b27f4be574ba8f14802ab94531bd60fa577851e576d4e1e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 5352 bytes
font_01_sfnt_off0000fa48.bin
4e45085f2922ee752cff4134716427abba26822a2322ca5746acd8ea8aae9838		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 11024 bytes
font_02_sfnt_off00011f27.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 4324 bytes

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