Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46d061799aa85bb…

MALICIOUS

PDF

76.3 KB Created: 2021-03-10 09:37:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2498b1949f6adb1aa15842064eb16837 SHA-1: b121cfc645e1bf9bce3353735eebf0b1b9f0210b SHA-256: c46d061799aa85bb44490af0943dcc507b63c626fc03842f7df0c33f8faae39d
194 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a malicious redirector, specifically designed to lure users with an image-based phishing attempt for free downloads. The embedded URL, 'https://crophysi.ru/strik?utm_term=warm+bodies+book+cover', is identified as a malicious redirector. While no scripts were explicitly extracted, the nature of the PDF and the redirector link strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • 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=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://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_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 5328 bytes
SHA-256: 4dba61fcb594ec6e58fad4e1f2d23295f4cb183cab15099e5a5ba551c6527ca1
font_01_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 10752 bytes
SHA-256: 28dc51aefe8f9d041c33e5e137a168722e49f5751e31bf97d21fcc0c18ec993b