Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d840a23ff746f7…

MALICIOUS

PDF

76.7 KB Created: 2021-03-11 01:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7b38a797057cb2803255c55c25aedc8 SHA-1: 1b16e6fb9a1fb0d363cc7e190635f4b77abd3420 SHA-256: 75d840a23ff746f7897b8af51527cb854fce9a5c896c0eaacf390368b5bee93d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment used to redirect users to malicious sites.

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://resalured.ru/123?utm_term=pc+building+simulator++portugues
    • https://cdn.sqhk.co/gixedomawa/Rhfiaid/washington_h._e._r._o_homebuyer_program.pdf
    • https://cdn-cms.f-static.net/uploads/4386337/normal_60480a3f16922.pdf
    • https://cdn.sqhk.co/gorokipo/jjfjdhg/50051193225.pdf
    • https://cdn.sqhk.co/zofizitene/zAjfcv2/expanse_season_4_episode_6_recap.pdf
    • https://cdn.sqhk.co/zipirevofu/hdgjgg7/seselomemogojewuz.pdf
    • https://cdn-cms.f-static.net/uploads/4422897/normal_6017accacb543.pdf
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5feafc2aac7f6.pdf
    • https://cdn.sqhk.co/wajerewuwer/hjj9ja6/depepowawedutu.pdf
    • https://cdn-cms.f-static.net/uploads/4472774/normal_6028109205311.pdf
    • https://cdn-cms.f-static.net/uploads/4368756/normal_6026eae145c27.pdf
    • https://cdn-cms.f-static.net/uploads/4470687/normal_603908b9cf202.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sifebina.epizy.com/firefox_32_bit_free.pdf
    • http://jofifabe.rf.gd/review_on_lights_out_2016_movie.pdf
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_af681994675c4748a6998c6d1f9a227a.pdf?index=true
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_89563615ce2646789b040935f6b31876.pdf?index=true
    • http://rasezufolob.rf.gd/torubukajukunupiwu.pdf
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_858c14e4653440fd8ac24fc6df70b47f.pdf?index=true
    • http://negifunowulag.rf.gd/how_to_connect_jabra_talk_5_to_laptop.pdf
    • http://kedokonox.rf.gd/2003_cadillac_escalade_ext_manual.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_6744b75de94b4b79a938eb3ecb783414.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d577.bin
7e699031feec4b87eaf3c0a323eeedf4bdd3df126f099dd0c55c7ddfc6815d01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 5536 bytes
font_01_sfnt_off0000e826.bin
bf22275fd260da415b13ca7f2252fd641aa8bdbd48ec6c6017c713ec72e5b8b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 11744 bytes
font_02_sfnt_off00010e36.bin
ccf879661c26e8d85a43d4fcfbba60320246430dcbf46b047d24072eb45b37a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 16132 bytes

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