Malicious PDF — malware analysis report

Static analysis result for SHA-256 463958b233997b15…

MALICIOUS

PDF

84.0 KB Created: 2021-03-28 14:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8d227f8b8ad0801b05e03894339fb9ac SHA-1: b2080c2d3329c9975833123411be474cddfbfb45 SHA-256: 463958b233997b15abd9db98c84473eacf5ac94f6edf15641099ab87a8b749b0
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and phishing lures. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically points to a redirector URL used for free-download phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the nature of the heuristics suggests the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/award?keyword=calendario+biodinamico+2020+pdf+brasil PDF link annotation
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/5659593.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/03f1c9d0b696513.pdfIn PDF document text
    • https://boxorefo.weebly.com/uploads/1/3/0/9/130969922/nesum.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/9087364.pdfIn PDF document text
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/4708276.pdfIn PDF document text
    • https://folejate.weebly.com/uploads/1/3/4/9/134902611/5470918.pdfIn PDF document text
    • https://wedarudojov.weebly.com/uploads/1/3/4/0/134012757/c420f.pdfIn PDF document text
    • https://natapuwofase.weebly.com/uploads/1/3/1/8/131857101/f59943106f1.pdfIn PDF document text
    • https://lifadupelede.weebly.com/uploads/1/3/5/4/135401245/webuz.pdfIn PDF document text
    • https://furivupes.weebly.com/uploads/1/3/5/2/135295821/koxiribisikugi_xerexa_poworojedok_vugetazatina.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/mozirolinitaje/answer_love_myself_lyrics_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/1145642030.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/chidambaram_temple_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/bobed.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/dalutalejigitadupab.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/52574736509.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/something_just_like_this_lyrics_guitar_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/king_bedding_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/33273781529.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/4126465680.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/10404310604.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/41293748200.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/car_racing_games_2015.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 5620 bytes
SHA-256: f3c495a66f4e86dfcfa5e01ba133f499f981cbbc4ae7c214b4df76257002f3e0
font_01_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 12640 bytes
SHA-256: 8c13045495449778a2f2e3666702647499add909057cdf37fa878c26c9d4c298
font_02_sfnt_off000129ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FF 16568 bytes
SHA-256: 744f0e7d85704c0d2b566a7a468622890dd255b65a86f0b4230b3f4a153e2950