Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7cf43cfb3095f0e…

MALICIOUS

PDF

95.4 KB Created: 2021-02-25 18:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d4bb223261513be39549f34007d595c5 SHA-1: aed18b7c2d093cd9dadb74d5963ae7225ee8eb85 SHA-256: d7cf43cfb3095f0eaa51674a0cdf47f249545fd32dd0526031eab7ed6f04958d
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic firing indicates a link to known malicious redirector infrastructure, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=honda+eu2200i+parts+manual In PDF document text
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/1633415.pdfIn PDF document text
    • https://wugebanog.weebly.com/uploads/1/3/4/7/134709888/lobevevorepogovawufi.pdfIn PDF document text
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/vipuzoda_dipuselaxug_wuwolodagalem.pdfIn PDF document text
    • http://8gusevshop.website/how_to_connect_plantronics_headset_to_phone0zker.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/620682.pdfIn PDF document text
    • https://kefavobora.weebly.com/uploads/1/3/6/0/136010588/jumofet-sodab-mezijirasiwo.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/65046171107kjdv5.pdfIn PDF document text
    • http://reduslim-official.website/pioneer_vsx-1020-k_7.14j0wc.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/wakozede.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/0971947e8.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/jiNXwIW/45340815870.pdfIn PDF document text
    • http://tradestaroffice.com/rukadavafiravovebuxirinat0g.pdfIn PDF document text
    • https://putukaxuke.weebly.com/uploads/1/3/1/4/131437363/weguligo_rewigimepipolin_muzupus.pdfIn PDF document text
    • https://nimosawi.weebly.com/uploads/1/3/5/9/135982357/dacf373b.pdfIn PDF document text
    • https://buniburus.weebly.com/uploads/1/3/1/6/131637527/c68c20ce92e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jejotatimub.rf.gd/kubumetojoremanotujem.pdfIn PDF document text
    • http://batefagut.epizy.com/gimovodafid.pdfIn PDF document text
    • http://nelipofamarul.epizy.com/bharat_ennum_naan_movie_songs.pdfIn PDF document text
    • http://tisoparumunezud.epizy.com/81257156252.pdfIn PDF document text
    • http://vetarobafawuk.epizy.com/30064496328.pdfIn PDF document text
    • http://sokogukuvuxe.rf.gd/51661936182.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_off00013779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 5340 bytes
SHA-256: ce6c3f45494f8a947dfacd4bcfed2f4223faf1a6324097e40559a6620b496db0
font_01_sfnt_off00014982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14982 11712 bytes
SHA-256: 8bb2210dbfa4c122d86a1ffffe6ded9d45555691386a7df2bf8dd23a9a574378