Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c8f0f886b22aef…

MALICIOUS

PDF

79.9 KB Created: 2021-04-03 03:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ff10606340e7797dcfd8990953a0249 SHA-1: 1a23d22dd6a2975539dafc52623c3fcddb6b73d0 SHA-256: 21c8f0f886b22aefddfd8c9a1c886bda5c2762438db07937200e9b9f1dcaf6dc
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to malicious websites. The primary URL, 'https://pelibifir.ru/award?keyword=demography+and+economic+development+pdf', is presented as a lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=demography+and+economic+development+pdf
    • https://static.s123-cdn-static.com/uploads/4425009/normal_5fdcf1b57ecec.pdf
    • http://misirabul.22web.org/goodnight_moon_lyrics_book.pdf
    • https://cdn-cms.f-static.net/uploads/4380700/normal_601bda20dc592.pdf
    • http://takovod.66ghz.com/adultery_paulo_coelho_english.pdf
    • https://cdn-cms.f-static.net/uploads/4477162/normal_603416be1cfe8.pdf
    • http://tobubolixej.iblogger.org/31899576242.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kelawezup.rf.gd/online_police_report_thailand.pdf
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_34daa9c47c6444938c478e64482e9157.pdf?index=true
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_b0b4efcdfa264962aa5cf346a0e7f739.pdf?index=true
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_ff965a2ff7b043a0a13e826c978899ce.pdf?index=true
    • http://kagubosewox.epizy.com/common_core_integrated_math_2_worksheets.pdf
    • http://lavuradisaxel.epizy.com/39723218196.pdf
    • http://wapowidomuf.epizy.com/manajemen_sumber_daya_manusia_strategik.pdf
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_3f9b12fa1a464416b86c1cc49a75a47b.pdf?index=true
    • http://xumizimewimapa.epizy.com/21121522960.pdf
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_63d9bade5c884e0eaef44d2a07b43604.pdf?index=true
    • http://tasetexogop.epizy.com/zuvewowogumumuxapu.pdf
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_6d113761ce844b64820a8f0abe5745dc.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_off0000fb26.bin
d6b5daeea2da5dbf89006bba7b7e36d7ab8a2a179feb8010168cf99ad2ee0108		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 5552 bytes
font_01_sfnt_off00010df9.bin
7f70aeb56d800dabe69393a0ef72add3a80ccb5699e11d3a7530fd3ee75e139a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 10744 bytes

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