Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd6005794ba3d25…

MALICIOUS

PDF

67.6 KB Created: 2021-03-10 09:37:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 99ff30da3024f30348aabc37748fe9f9 SHA-1: e842016aec2ebe05b2969adcdcc93fd37bc75144 SHA-256: 1bd6005794ba3d25fa9fed76dfdab29a2388d1a06446c41ea27db82e6181266e
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of phishing and redirection. It contains a link disguised with a book cover lure, pointing to the suspicious URL 'https://crophysi.ru/strik?utm_term=warm+bodies+book+cover'. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to lure users to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9227

Heuristics 4

  • 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.
  • 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.
  • 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=warm+bodies+book+cover In PDF document text
    • https://cdn.sqhk.co/pebekaja/cnhc3ig/63071912283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_60104e370df54.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/kiwokevudum.pdfIn PDF document text
    • https://cdn.sqhk.co/jitamoxi/e7iijfq/win_10_enterprise_2016_ltsb.pdfIn PDF document text
    • http://nosinoski.shop/lemokomanugovez6q5h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_6042f160599c9.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/adulterants_in_foodstuff_chemistry_project.pdfIn PDF document text
    • https://cdn.sqhk.co/xojafimib/CKhhfgj/12036084319.pdfIn PDF document text
    • http://creamwalls.online/ponamuraladostfkh2.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/gijh4v1/alienware_aurora_r10_specs.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/13213404196.pdfIn PDF document text
    • http://flathead.us/how_to_heal_inflammation_in_the_body_naturally37omi.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/FNoMUgg/42126676630.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/tebinobizufazef.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/mafavuzenoliki/vopitudenavitekojol.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/64944617392.pdfIn PDF document text
    • http://bitines.myartsonline.com/integral_calculus_by_ak_hazra_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/what_is_site_processed.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/acr_form_for_gazetted_officer_bangladesh.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/nepidonebejufafezonevu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/84628476468.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/guzadufuj.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/sonic_all_stars_racing_transformed_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/pelumexaguxekokebanejabal.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/21814541061.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 5328 bytes
SHA-256: 4dba61fcb594ec6e58fad4e1f2d23295f4cb183cab15099e5a5ba551c6527ca1

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