Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d98c40102476c2…

MALICIOUS

PDF

88.3 KB Created: 2021-04-27 13:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22c42a8217819c5364d1c8ef18fa3ad3 SHA-1: 6a5c56c1a0d0ed5f01d0e624efbf3e55a59478c2 SHA-256: c4d98c40102476c28d04c332f07f735be391eb02683eddd25f29d013a01b3f42
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://dafemum.ru/strik', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'When did doctors make house calls'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=when+did+doctors+make+house+calls
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/wurujiliz.pdf
    • http://kaboperesepasu.iblogger.org/plant_virology_book.pdf
    • https://radumudoxelis.weebly.com/uploads/1/3/4/2/134235428/jusibo-leluribusivad-podewopazoxusu-mogarekajov.pdf
    • https://cdn-cms.f-static.net/uploads/4490123/normal_6016227aad866.pdf
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/7288025.pdf
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5fed08710b5e6.pdf
    • https://jegiwagoxupida.weebly.com/uploads/1/3/1/3/131379361/gadevafofuzani.pdf
    • https://nulasexojexof.weebly.com/uploads/1/3/4/0/134012614/6326db.pdf
    • https://cdn-cms.f-static.net/uploads/4411479/normal_6059d60f7bf52.pdf
    • https://cdn-cms.f-static.net/uploads/4426675/normal_603e0ff042a61.pdf
    • http://foxilajat.sportsontheweb.net/14976158464.pdf
    • https://tiwoboromezusud.weebly.com/uploads/1/3/0/8/130874009/kidamudobatop-kupujurowevof-witek.pdf
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/zagozufozeda.pdf
    • http://sesumuruvo.22web.org/battlenet_destiny_2.pdf
    • https://cdn-cms.f-static.net/uploads/4405459/normal_60658f58c240e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bededuxotulapil/coleman_lantern_replacement_parts_walmart.pdf
    • https://s3.amazonaws.com/wexukufedepim/who_is_the_pioneer_of_cognitive_psychology.pdf
    • http://kazowive.epizy.com/sears_kenmore_series_70_washer_manual.pdf
    • http://temodorofeg.atwebpages.com/ropolamasujekufolidumeviw.pdf
    • https://s3.amazonaws.com/padosumifubobo/what_does_pali_mean_in_spanish.pdf
    • https://s3.amazonaws.com/nemafu/how_many_time_can_you_day_trade_on_robinhood.pdf
    • http://dudaturid.rf.gd/batiwogupa.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_off0001188c.bin
45c9cafbe71c9bd7048d7ef3263ec4e3a6e104c9b4eb235bc8c3d0e03ef42369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 5256 bytes
font_01_sfnt_off00012a48.bin
99a6773c1cfb2b122f7b70fc30c7b12af9bc11ba7fb5756e3f9f24ac99653a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A48 12748 bytes

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