Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48e85729a3ba8de…

MALICIOUS

PDF

74.3 KB Created: 2021-05-03 17:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 279d9827eb09e6fd3f15d220636ffc2d SHA-1: a86b982a69bd5d9832b458a3df42202f08a49077 SHA-256: a48e85729a3ba8de901456e7daea3960d4b38258ca8d37148ac5cd99592c4d4d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs points to 'lunesygets.xyz', which is flagged as a potential phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=technical+drawing+applications+icse+board+paper+2015+solved
    • http://lunesygets.xyz/716716119610w4sz.pdf
    • https://cdn-cms.f-static.net/uploads/4375887/normal_603c3ef5a3576.pdf
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5fc72fbb554eb.pdf
    • http://forexgeeks.net/55522978396h6j5t.pdf
    • https://megoximigiwuboz.weebly.com/uploads/1/3/4/5/134579220/nupelarefota.pdf
    • http://levelupguild.com/why_does_straight_talk_not_allow_hotspotvxkgn.pdf
    • http://bigtittybella.com/flexconnect_local_switching_vs_central_switchingl90y9.pdf
    • https://mugejonisisekof.weebly.com/uploads/1/3/1/4/131437633/1512022.pdf
    • https://felomavemupej.weebly.com/uploads/1/3/4/5/134583365/xetinipeke-paxitereb-rikokatem.pdf
    • https://mawatewif.weebly.com/uploads/1/3/0/9/130969671/ba3b1f3b9b.pdf
    • http://vizubezawuz.iblogger.org/54377124865.pdf
    • http://bazezirovif.iblogger.org/93094202257.pdf
    • https://malugula.weebly.com/uploads/1/3/2/6/132695531/9768723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wejuvono/eminem_venom_music_video.pdf
    • https://s3.amazonaws.com/gimisorixosu/3711830082.pdf
    • https://s3.amazonaws.com/meludav/what_are_the_materials_required_for_construction.pdf
    • https://s3.amazonaws.com/dugibabafod/gubabebufu.pdf
    • https://s3.amazonaws.com/bulujono/sokekokorodarif.pdf
    • http://guwaduroredidaj.rf.gd/calendario_serie_c_2020.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_off0000e309.bin
02fd9602f82e48c2627c9d2af36bd55abaded883b289874c9bf73cd4c8e63a32
pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 6028 bytes
font_01_sfnt_off0000f79f.bin
3309d81fcab145e50d40616ed80e16bc4036c067f440505d243167203ed347cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 10668 bytes