Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c31b1063762121…

MALICIOUS

PDF

77.0 KB Created: 2021-03-31 00:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80719d79cdf1c646f3a650ca51472892 SHA-1: d9e982a02dc5ae13919a3d63d75fd84fb4aec5b1 SHA-256: b6c31b1063762121b7e2dee7049f0acf70f2f22432637bca3fa91371916ad1ac
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing page or download a second-stage payload. No scripts were extracted, but the PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=which+printer+is+best+for+photos+inkjet+or+laser
    • https://cdn-cms.f-static.net/uploads/4383567/normal_60579e84aac0c.pdf
    • http://oneplusonemain.xyz/death_note_misa_english_voice_actor1grv3.pdf
    • http://tk-pobeda.site/lavuvinekagelurz03.pdf
    • https://cdn-cms.f-static.net/uploads/4372382/normal_601aadfb76696.pdf
    • https://static.s123-cdn-static.com/uploads/4443371/normal_5ff82994258b8.pdf
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5fe88310e886b.pdf
    • http://creditscorecard.info/4910486824399u3p.pdf
    • http://liwitesuzemumex.sportsontheweb.net/download_bnf_75.pdf
    • http://rbqjkwklnd.xyz/reading_comprehension_practice_high_schoolut7hn.pdf
    • http://pearhaidhr.fun/hack_game_jurassic_dino_water_world_apk4d825.pdf
    • https://cdn-cms.f-static.net/uploads/4418367/normal_6032d5fc49427.pdf
    • https://zegikawa.weebly.com/uploads/1/3/4/6/134640481/878af014aed.pdf
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/vakozafaxam.pdf
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/d1dedb6.pdf
    • https://wizenifove.weebly.com/uploads/1/3/4/3/134308138/xojadadode-nolipipanoj.pdf
    • https://vibajadulefunuk.weebly.com/uploads/1/3/0/8/130874079/9221893.pdf
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6026d54e16b08.pdf
    • http://webpost.pro/44176144502agpbv.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_603b7135b50f9.pdf
    • http://knitfqph.site/etude_house_face_mask_price_philippinesob3g2.pdf
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5fe3af5d6580c.pdf
    • http://javefuxola.getenjoyment.net/telugu_devotional_books_free_download.pdf
    • http://talajifit.mywebcommunity.org/bartleby_the_scrivener_summary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef53.bin
c6330b813b81a92d3e699758f001d80212382f45f72dbd74d96b7f37b94a781d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 5396 bytes
font_01_sfnt_off000101bb.bin
1f19a5b2122504559f1a5d14faf4c84898e68f2c5bd4c6c80d95f57175f83ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10720 bytes

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