Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccae5818194ff6ed…

MALICIOUS

PDF

81.0 KB Created: 2021-04-18 10:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5df8f5462ab3ed77fcd9162bfee0e566 SHA-1: d0ecb2c1e99abeb597f3199e7af4ccb1328ff319 SHA-256: ccae5818194ff6ed99c52ccb20b21e5457f8c99eba1e1fa392743bfa544d3eb9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('midufefew.ru') that is likely used for phishing or to serve a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to English language practice.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-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://midufefew.ru/strik?utm_term=english+sentence+structure+practice+test
    • https://cdn-cms.f-static.net/uploads/4369927/normal_601468e4524b9.pdf
    • http://xomofaki.getenjoyment.net/ap_us_history_review_book.pdf
    • http://jefexon.22web.org/radical_behaviorism_the_philosophy_and_the_science.pdf
    • https://cdn-cms.f-static.net/uploads/4489734/normal_60204e39bd1de.pdf
    • https://cdn-cms.f-static.net/uploads/4384655/normal_603c1314e6899.pdf
    • https://cdn-cms.f-static.net/uploads/4409602/normal_605c29afc0d22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ximupuv/asbestos_abatement_form_city_of_calgary.pdf
    • https://s3.amazonaws.com/nuxulikiwab/cinelli_superstar_size_guide.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/zuzogakev.pdf
    • https://s3.amazonaws.com/robumuduluwise/how_to_take_evening_primrose_oil_to_get_pregnant.pdf
    • https://s3.amazonaws.com/dazovosugev/ribev.pdf
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_e024a520161a4aac8f2ee409d8d7e98c.pdf?index=true
    • http://kurujabarufuxe.rf.gd/56843561455.pdf
    • https://s3.amazonaws.com/lezerawe/77048320105.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_7c3feb4f38804bb1b3e0f68d3cf38d1e.pdf?index=true
    • http://jilatunotefen.rf.gd/vajajopozotofo.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_5a5fb1624d42455e90cc33c4d1d11836.pdf?index=true
    • https://s3.amazonaws.com/gorajikunobixi/95946042730.pdf
    • http://ravesuvanobil.epizy.com/96556699233.pdf
    • http://wotidupodugi.myartsonline.com/tm-ac1900_rt-ac68u_difference.pdf
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_69f69b158a12488c91fe0af4bc859d43.pdf?index=true
    • https://s3.amazonaws.com/vitelitubovuluj/63338969205.pdf
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_875edffdb26143dfa09c0502fab1c385.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdfc.bin
fbb8039280e9ff27096156eeab9adf3ac6e451028318779d7322e5172d228505		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 5152 bytes
font_01_sfnt_off00010f86.bin
2784dfb35b82e1a9f9181a51877811700d4cd03352a6dd6742cbf0492f71a222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 10920 bytes

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