Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea857cef5ee620c…

MALICIOUS

PDF

83.6 KB Created: 2021-05-16 18:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a355caf94bf5eb9b63b6fb0d8337c225 SHA-1: 71020cbc2439ba0b67f093687f0771255f1fb32c SHA-256: fea857cef5ee620c45854c0258c14e51ec95daf1f84066d56e475b01d06f8010
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=netgear+ac1600+review+for+gaming
    • http://netewe9.xyz/how_often_should_a_prius_get_an_oil_changenfokz.pdf
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/098e8188b7.pdf
    • http://opensalle.xyz/53514879599ux292.pdf
    • http://generatorsale.ru/samsung_s4_mini_price_in_nigeria8mfue.pdf
    • http://tublitalia.fun/jubigumisekaxoforzlmms.pdf
    • http://jowakemanek.iblogger.org/research_approach_deductive_and_inductive.pdf
    • https://pafetujesotizi.weebly.com/uploads/1/3/5/3/135348857/zapuk.pdf
    • https://cdn-cms.f-static.net/uploads/4385421/normal_60568bcb77836.pdf
    • https://cdn-cms.f-static.net/uploads/4444622/normal_5fe7e6517bb74.pdf
    • http://mihetos.xyz/wobireta3482g.pdf
    • http://all-system7.xyz/widomuzirebapugamivebuymh6r.pdf
    • http://copyrightsupport-ig.com/674567981540hco9.pdf
    • http://sudazoraxo.22web.org/wavupesineduf.pdf
    • https://static.s123-cdn-static.com/uploads/4452624/normal_5fcbca12a94b8.pdf
    • https://static.s123-cdn-static.com/uploads/4475728/normal_5ff6c42b0d35d.pdf
    • http://reduslimer.website/nabemubiboxmwube.pdf
    • http://nickned.me/pafotow0ciy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_e5331769d5774bd1b8d73a088f1709a1.pdf?index=true
    • http://gozajogef.rf.gd/adobe_scan_for_pc_free.pdf
    • http://dozonexupiwef.epizy.com/chotta_mumbai_malayalam_film_songs.pdf
    • http://fijedenojex.rf.gd/ijazat_movie_song.pdf
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_c0d4cf482f614d2e84d4ca3e3f0ee6d8.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb88.bin
ecce579833b01b0e73863a41282e8333e9cc209ad0e9f1a2da672ba23ebc1eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 5248 bytes
font_01_sfnt_off00010d68.bin
210e476aecb2e002192d0dcc172d04c39e2be37cca1f7e3ef2fc7f67eec77ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 11116 bytes
font_02_sfnt_off000132fa.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 4324 bytes

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