Malicious PDF — malware analysis report

Static analysis result for SHA-256 42527793e5e9d1f6…

MALICIOUS

PDF

85.8 KB Created: 2021-02-28 04:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3431177ec8ed54fc01cb16f6d607be5f SHA-1: dce5b29c2d5400ae1afb539ac926eb2b8d588c24 SHA-256: 42527793e5e9d1f6bca25525c5b86e5fa1ba140684358ee9c61074d0e52648c3
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 or subdomains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The ML classifier also flagged the PDF with high confidence. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a malicious campaign, likely involving redirection to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=meaning+of+adversary+in+the+bible PDF link annotation
    • https://cdn.sqhk.co/bomemenun/ghaphgp/gilimid.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/dnd_5e_best_true_polymorph.pdfIn PDF document text
    • http://wide-do.top/2745038564562hst.pdfIn PDF document text
    • http://gugatem.22web.org/53623902436.pdfIn PDF document text
    • https://bovaromekefa.weebly.com/uploads/1/3/4/4/134403346/zinivor.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/7716682.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/file_manager_for_ios_7_downloadvi8xq.pdfIn PDF document text
    • http://ryukzak.digital/ziropuwanolimatupifetemao1rrh.pdfIn PDF document text
    • https://cdn.sqhk.co/gipirukanut/h4gjgcC/repost_photos_videos_igtv_video_downloader.pdfIn PDF document text
    • http://greatmasters.biz/bajajozurwf76x.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/jjegghf/vikings_panthers_2020_highlights.pdfIn PDF document text
    • https://vijejomikozo.weebly.com/uploads/1/3/4/6/134668467/pekatep.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/how_to_override_ink_replacement_epson.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/jeDijgf/15650590820.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/87037839253.pdfIn PDF document text
    • https://xefulexemifin.weebly.com/uploads/1/3/1/3/131398452/1729531.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/TTjfbjc/dunkaroos_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/ahbjiI6/50083043662.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wonenuw.epizy.com/zofefumevuxarit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 5264 bytes
SHA-256: 599c6efe52bf2654f00b9c87af2cdb810aaa310696550dc022ad21b0e122da81
font_01_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 10276 bytes
SHA-256: ed6224764c4e54cff68b8f2bc9e58d9d42dd3c397198b16dbba061f91da1e362
font_02_sfnt_off00013b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c