Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a8e38b8c5a4285…

MALICIOUS

PDF

67.2 KB Created: 2021-03-02 20:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 68b6452f5f37f90a799a4034b7a16da3 SHA-1: 3e74b72ffca25d6b0123649f2f7fa559a318f240 SHA-256: 01a8e38b8c5a4285dc066b8952bb2d508cee02d369656870cbc105ca383aa367
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure (https://crophysi.ru/strik). The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with a malicious document designed to lure users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=cal%252Fmol+to+j%252Fmol In PDF document text
    • https://cdn.sqhk.co/numovasovev/cejbzJq/nasa_launch_today_florida.pdfIn PDF document text
    • http://xejevojesinil.22web.org/altitude_tracking_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/gimanoretev/hlicgdD/cooped_up_meaning.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/orbit_conserve_watering_timer_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/SGKAPid/capital_funeral_home.pdfIn PDF document text
    • https://cdn.sqhk.co/dilereku/g8Uhejj/saxafufuxunosax.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/genie_intellicode_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/jjhdeor/83936777925.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/37759171363.pdfIn PDF document text
    • https://cdn.sqhk.co/dagorabowixu/ehgZ6gg/20759036748.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/giJGcOf/88430343626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/duwitebalu.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/replace_makita_circular_saw_cord.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/who_is_the_best_portrait_painter.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/77160966181.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/59430225241.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/saretuwevogepolubegejos.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_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 4576 bytes
SHA-256: 924b76d3e3227ab9597b14f680a3febcfe7b5d64d7effd7109b5560bb23428ff
font_01_sfnt_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 11856 bytes
SHA-256: 0d5515d6432652dfe849789a14823a09bcd6e898c932339b1d91502452115496

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