Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa485646e348742…

MALICIOUS

PDF

76.2 KB Created: 2021-04-01 14:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0234402646fe5308ed5d3daf17a430a5 SHA-1: d6a619c906088c2f18c9e7a49224d3295e81e284 SHA-256: 7fa485646e348742f0e95bfb495c8c3a51ebd7305f05b07e84db4f880308b0ef
252 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=agneepath+2012+movie++720p+worldfree4u In PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/rowisedotaxusufu.pdfIn PDF document text
    • http://prequester.online/935275867845wn6x.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/furujepalojobaruvev.pdfIn PDF document text
    • https://nolabuxovitu.weebly.com/uploads/1/3/5/3/135305824/bomulukon_tabenurofa.pdfIn PDF document text
    • https://jetezilim.weebly.com/uploads/1/3/0/7/130775858/gezekimezajozapojoro.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/zRjjRgg/ocoee_river_barn.pdfIn PDF document text
    • https://voxasofipazo.weebly.com/uploads/1/3/1/4/131407247/9286197.pdfIn PDF document text
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/fosulepijujunotifed.pdfIn PDF document text
    • https://gonudelosake.weebly.com/uploads/1/3/4/7/134750135/29f85f9c2.pdfIn PDF document text
    • http://purefuko.22web.org/baby_girl_names_starting_with_s_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/iPLOto3/webufenagu.pdfIn PDF document text
    • https://pepuxopotu.weebly.com/uploads/1/3/5/3/135390253/b9203.pdfIn PDF document text
    • http://jiludedo.iblogger.org/94608842079.pdfIn PDF document text
    • http://hotsales-com.xyz/antiphospholipid_syndromeksv45.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/ihdlShi/gsmarena_apple_ipad_air_2.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/boxeranoxamivap.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/ehjgfia/bubble_fish_lamp_b_m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 5912 bytes
SHA-256: 122f5e16857bd5c542c734b83d27a9bd2a0e2226ad4b70cd73313fc536a288b6
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 11680 bytes
SHA-256: 10c67d09407ce347e50f492f4679d90aaf9dcd871c510c6d00fdbc19ef554288

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