Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57e94e7d8a568d5…

MALICIOUS

PDF

71.5 KB Created: 2021-02-07 17:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e19a84b1fab17c5ab3461f0a6d4b83ff SHA-1: 26a8971137fc336a1ef24dbb4f7644ccb71575f2 SHA-256: d57e94e7d8a568d5ade4c2aa0f3eb00640a997e24e6ef946187017a2456d7e4a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to distribute malware or lead to phishing sites. Heuristics indicate the presence of malicious redirectors and a general phishing intent. The ML classifier strongly supports the malicious nature of this PDF.

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
  • 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://crophysi.ru/wb?keyword=adverb%20clause%20of%20condition%20pdf In PDF document text
    • http://bridgecommerce.com/change_notification_sound_android_app21hez.pdfIn PDF document text
    • http://nazhivy.net/spc_android_internet_smart_tv_box_9200nqmmyt.pdfIn PDF document text
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/linufifapizu.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/3692dfd6d51.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/bLhajaf/bike_racing_2019_apk.pdfIn PDF document text
    • http://naturwows.space/ninja_fighting_games8ok73.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/jjBhhif/wheels_on_the_bus_bussongs.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/jbSgjib/8563766176.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/ghhvagc/free_spelling_word_games_for_2nd_grade.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/7f18328a1f3f.pdfIn PDF document text
    • https://wizudagusosok.weebly.com/uploads/1/3/5/3/135317744/cbe9f507d.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/mjchiji/allianz_efu_health_card_benefits.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/lekezaru/29332069468.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/bike_ride_game_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/slideshow_powerpoint_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/medical_tourism.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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 5340 bytes
SHA-256: 17c03ddde5fad8e6ddec658723b709de62abac79f43ee4177ca2973cdaa3b529
font_01_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 11544 bytes
SHA-256: 7afb59e6b2ef3206fc485487e27216bf8a9cac61571bf3891ec41ee905ec9efe

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