Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9eb7d92352aa631…

MALICIOUS

PDF

83.3 KB Created: 2021-03-27 18:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf0ea8efef30d4bde7a47d0d8842abe5 SHA-1: 22a2ad4d89bcdd91fb63a08e15579aaae139d698 SHA-256: f9eb7d92352aa6312a51bc805a190eb901455a1b561962aaaf573af5e4b94ecc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or link farm attack. It contains numerous external URIs, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM' containing 30 external PDF links. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly suggest an attempt to redirect users to potentially malicious websites. No scripts were extracted from this sample, limiting the ability to determine specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=contoh+rpp+k13+sma+biologi+pdf
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/869880.pdf
    • https://static.s123-cdn-static.com/uploads/4474752/normal_6007bf505d02e.pdf
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5ffe51b16c1db.pdf
    • http://de-bewertung-889562.icu/levosajefebutitomukiyi6e.pdf
    • http://milesnires.xyz/72962637386z3pza.pdf
    • https://cdn-cms.f-static.net/uploads/4409239/normal_601f11f31dac4.pdf
    • https://static.s123-cdn-static.com/uploads/4370288/normal_5fe3488d5bd13.pdf
    • https://cdn.sqhk.co/fedelubu/hiSjfie/red_rose_movie_2016_cast.pdf
    • https://cdn.sqhk.co/xakutofi/hPNiiib/zelle_wells_fargo_500_limit.pdf
    • https://bolegabafewibe.weebly.com/uploads/1/3/4/6/134651697/wevekezujura-xezutomifobowi.pdf
    • https://cdn.sqhk.co/xexerekija/jcHjbMa/47779155983.pdf
    • http://febafavawi.iblogger.org/list_of_adjectives_to_describe_personality_traits.pdf
    • https://cdn.sqhk.co/rabuzopat/fa5yKif/assassin_necromancer_build_skyrim.pdf
    • https://cdn.sqhk.co/gijimexuv/olTgUhg/zukakabasop.pdf
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/ritasosew.pdf
    • https://cdn.sqhk.co/gulanuwe/Qjb6if6/real_followers_pro_apk_ios.pdf
    • https://cdn.sqhk.co/rezejigobip/xnif1EH/d_h_f_engineering_ltd.pdf
    • https://simokodopegaliw.weebly.com/uploads/1/3/0/7/130776428/xosajegawanamis.pdf
    • https://xisofufewazexi.weebly.com/uploads/1/3/0/7/130776718/c82fc17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wutasudi.epizy.com/petrel_seismic_attributes.pdf
    • http://wufutogaj.epizy.com/96278721646.pdf
    • 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_off00010875.bin
209aa4eb357a71fbe515fc4a31e854e31a73da6209bd29aa74b1b21d0b9d30ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 5780 bytes
font_01_sfnt_off00011bf9.bin
0380e40faf9cfae789297faf80cf8c44415fb363118027ded76cd9ca822f0cf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 10556 bytes

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