Malicious PDF — malware analysis report

Static analysis result for SHA-256 765d9752970ed285…

MALICIOUS

PDF

77.4 KB Created: 2021-03-26 07:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 203ba0a0906bea645dc20db726f792d0 SHA-1: b70ed33577f49a839655c0f5b72c48a623b16276 SHA-256: 765d9752970ed28520994bad5f7c05cea4bee667ab297ed487233cb7c1c98813
294 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged by multiple critical heuristics as a malicious redirector and a payment redirection lure. It contains numerous links, with a primary one pointing to 'https://yafferge.ru/strik?utm_term=gtx+970+sli+vs+rx+5700+xt', which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to hardware comparisons, which is likely a lure to disguise the malicious intent of redirecting users to potentially harmful sites.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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=gtx+970+sli+vs+rx+5700+xt In PDF document text
    • http://katipef.medianewsonline.com/suxadapi.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/xavemo.pdfIn PDF document text
    • http://werojati.getenjoyment.net/nisumikiduwoxafu.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/cancionero_picot_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/iFgihU6/blue_heeler_german_shepherd_mix_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwuwoki/ghajjdm/xejabinifit.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/6a7gigj/tiny_archers_hack_mod_apk_download_free.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/nasemiperogebegodosoga.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/ielwidv/nuralusisugapomana.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/gedexim/how_to_change_battery_in_weight_watchers_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/60880393640.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_89109b18a8494fd5a2fd3ed4f3363e17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/dietary_guidelines_for_total_fat.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/29700841073.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/vanilla_ice_cream_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/fios_router_configuration.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_e1ed35ce58db4f249dbf378ebc06f2e8.pdf?index=trueIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_c0e6930929494d7c997c4b5fbc9f809c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/samozogurijovat.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_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 5128 bytes
SHA-256: 17104240cf9bdf197c4e04c477e2f3b0a7444a8f055c25f6292dd1e2894a34ca
font_01_sfnt_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 11724 bytes
SHA-256: 3575b213e5af88a602dd8d2acf145160166c15074470fb8db3b2b90a42a77d33