Malicious PDF — malware analysis report

Static analysis result for SHA-256 448a9084bde394f0…

MALICIOUS

PDF

79.9 KB Created: 2021-03-12 12:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 385334681ddc5dbddfca60d83a72efd0 SHA-1: b5a5b69695e4dad22afcd3ee2b236f5e37e5c97f SHA-256: 448a9084bde394f088cba8adf44032c95b31f952af54de8819f8a197f0400779
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF hosting sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/award?keyword=diplomov%25C3%25A1+pr%25C3%25A1ce+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428334/normal_5ff9ef4452618.pdfIn PDF document text
    • https://xiwotedusogatif.weebly.com/uploads/1/3/0/7/130775269/rokixizipapizupi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409244/normal_6006e54fe0ac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_5fe8726e74a07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5fe38108a36b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500667/normal_5ff9ce3c7d92e.pdfIn PDF document text
    • https://bowutemol.weebly.com/uploads/1/3/4/2/134234741/fefezuwobimurotekol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_6030917c64c96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_60263d9ad16ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fdc084589338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sumidemeg.epizy.com/felusezakozi.pdfIn PDF document text
    • http://fujesotes.epizy.com/xenumejovifevebed.pdfIn PDF document text
    • http://riwuzapivegeb.rf.gd/giforodu.pdfIn PDF document text
    • http://fidobagasamos.epizy.com/chemistry_handwritten_notes_class_11.pdfIn PDF document text
    • http://doninedu.epizy.com/98266470181.pdfIn PDF document text
    • http://saripugoxek.rf.gd/66924915637.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/piano_accordion_sheet_music_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/sustainable_building_design_manual_volume_2.pdfIn PDF document text
    • http://vezonufibil.epizy.com/what_if_you_tie_the_dealer_in_blackjack.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 4808 bytes
SHA-256: 19e87b997e9f88fce28440435051e5018579e7f008e3005d4b29e99705a714cf
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 12696 bytes
SHA-256: 51fb3421cc8389156d9a9e5c01020200f1eb12d5e5e1e94b0beaf7be8959eea7
font_02_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3