Malicious PDF — malware analysis report

Static analysis result for SHA-256 b808ae663c03f8e3…

MALICIOUS

PDF

75.5 KB Created: 2021-01-23 17:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f28df2bbc2f4485b0dcc8dfa9fcdf6f5 SHA-1: 9e3a74afa28c879018f3295d185feaa60ad47dc9 SHA-256: b808ae663c03f8e3c0606c817ca3be84651126bb6e1cff9e334abfef2e7bb446
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, contains references to 'Byrsonima crassifolia pdf' and 'wkhtmltopdf', suggesting a lure to a website. The presence of multiple external URIs, some pointing to disposable hosting, indicates an attempt to redirect the user to a malicious site for further exploitation.

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
  • 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.
  • 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://trafffi.ru/aws?utm_term=byrsonima+crassifolia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5fd5f37377887.pdfIn PDF document text
    • https://site-1244404.mozfiles.com/files/1244404/46373220416.pdfIn PDF document text
    • https://site-1178820.mozfiles.com/files/1178820/memidit.pdfIn PDF document text
    • https://site-1171554.mozfiles.com/files/1171554/apple_music_artist_profile_distrokid.pdfIn PDF document text
    • https://site-1188816.mozfiles.com/files/1188816/45260312393.pdfIn PDF document text
    • https://site-1177663.mozfiles.com/files/1177663/74535452107.pdfIn PDF document text
    • https://site-1207189.mozfiles.com/files/1207189/dictionary_english_to_farsi_with_pronunciation.pdfIn PDF document text
    • https://site-1177421.mozfiles.com/files/1177421/accounting_dictionary_english_to_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412380/normal_5ffe2e319c3f6.pdfIn PDF document text
    • https://site-1173371.mozfiles.com/files/1173371/pinusepuvaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486054/normal_5ffa43f9b6722.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/57058554052.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/Cjigcjf/math_games_online_2048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toramowajo.epizy.com/2757916108.pdfIn PDF document text
    • http://zovuzizosagedip.epizy.com/distributive_property_polynomials_worksheet.pdfIn PDF document text
    • http://metusajixano.epizy.com/bozusisegofonimabepovux.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/mijutosodagub.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/bela_bela_english_song.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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 5452 bytes
SHA-256: 42431510196dc0efb4087f370455292004290926899b57fa43c9b3f1eeec9765
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 11668 bytes
SHA-256: ba932acf10540190f21f5fe4f974bbba86b85a761aea799edc56562f43746d97

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