Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9891b6e880acc1…

MALICIOUS

PDF

75.6 KB Created: 2021-03-30 14:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c272f94b2d41f1a3ed0020389956af8f SHA-1: 3f15178be0fbfd69c5439fc315dc69f7fae9900f SHA-256: dd9891b6e880acc1442deb88cd7e179a60c03f27a4e07b4516806aecb6e403dc
186 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 hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/award?keyword=oxford+discover+2+student+book+pdf PDF link annotation
    • https://sokijaxojo.weebly.com/uploads/1/3/5/4/135400829/2366056.pdfIn PDF document text
    • https://rogefiraf.weebly.com/uploads/1/3/4/5/134581109/jidive-bovoba.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/vizio_e320vl_remote_app.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/tosugekolilab_pizamixi.pdfIn PDF document text
    • https://ziwolowuwuxux.weebly.com/uploads/1/3/5/3/135321756/b387203db.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/jilepole.pdfIn PDF document text
    • https://wabexerimib.weebly.com/uploads/1/3/0/7/130739061/f385b15bf0c09bf.pdfIn PDF document text
    • http://extraevents.ru/scdmv_form_400dhqfy6.pdfIn PDF document text
    • http://helplnstagramoffice.com/baby_boss_2_full_movie_freekirdh.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/61775754788.pdfIn PDF document text
    • http://naturfresh.space/dziobas_rar_player_apkdi3ev.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/92105804784.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/zoruzebiwerogezojan.pdfIn PDF document text
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/ranefekodovesuw.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/23444857229.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/adobe_creator_software_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/rodrick_rules_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/cut_files_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/ziratemedaki.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/lularowimaw.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/5238441261.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5396 bytes
SHA-256: 50e4fd5cb9f4094677c227b7d645f88485f14bf19c031ead5a1e0d485c36cfcc
font_01_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 11292 bytes
SHA-256: 23da79411a6845cc589b80a236f5e94c6cd2212ceafdb835fabd41ae487a4623

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