Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d57179c9c5e686…

MALICIOUS

PDF

83.8 KB Created: 2021-04-26 01:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0762868bdeed4e9a9bc24031322de2b3 SHA-1: dfc435aaa237aacee5a16af127c43c30eee30547 SHA-256: d7d57179c9c5e6865026003ebe36dd265e288613931b83340994ee38f9310083
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/strik?utm_term=silence+becca+fitzpatrick+audiobook PDF link annotation
    • http://remastacer.com/4444094776979fx4.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/bikobafidumukukoluda.pdfIn PDF document text
    • https://pobikutilun.weebly.com/uploads/1/3/4/8/134871216/58ad1.pdfIn PDF document text
    • https://kotasixunepa.weebly.com/uploads/1/3/0/7/130776076/semusojigadaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_604842fae7186.pdfIn PDF document text
    • https://lukafitujukeme.weebly.com/uploads/1/3/3/9/133997152/1540751.pdfIn PDF document text
    • http://choosemadam.site/do_metal_atoms_form_cations_or_anionsce0h4.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/xolemujevu-bixirapiwapurij-xegizegufugir-malezonikiruz.pdfIn PDF document text
    • http://dkmz2.club/48027493735sri4t.pdfIn PDF document text
    • https://menufaron.weebly.com/uploads/1/3/0/7/130775522/migodenu.pdfIn PDF document text
    • https://mifadugusukar.weebly.com/uploads/1/3/5/3/135337027/4183682.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494435/normal_5ff37f7713054.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/kateviwibejitufajago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/308aa24c-b2ea-4681-8fd5-b8bb130a83bd/xaxavuzuxejikuvajaturox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcc4a8d-a994-4f83-8756-d8bc8ab2ca7b/dakes_annotated_reference_bible_app.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/togivulugakojanunemaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355d26e4-bceb-407b-b0a1-60b2433b74b9/kejep.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/son_chiraiya_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/how_long_to_cook_chicken_in_ronco_rotisserie.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/80974870313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bb73a1-f9bd-4b7b-99c8-118429044b77/18379203784.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/chunar_abcd_2_320kbps.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_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 5328 bytes
SHA-256: 591baae5ce25bcca9be679dcc0c7487e7fe137c22181ae9d7451cf0e55178ffe
font_01_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 11984 bytes
SHA-256: 7400034186e4f67a715195e66b1bc831d2e4c2059e49a40ae1b4d41ec8917753