Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0f0881645bcec9…

MALICIOUS

PDF

99.1 KB Created: 2021-04-11 16:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc769a4bed2d2bdd432a1ac2775a2cc4 SHA-1: 5843e93d349323d0a5110ee6df0541251933b64b SHA-256: 8d0f0881645bcec92b64a21854befcd11a521d2b74be346ce1709d259dee5064
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a potential for downloading further payloads or phishing attempts.

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://botokaw.ru/strik?utm_term=doctor+zhivago+movie+synopsis
    • https://cdn.sqhk.co/sisadenev/SWCNhds/98608219771.pdf
    • https://cdn.sqhk.co/nepopagugela/zN1ihhf/free_cello_sheet_music_classical.pdf
    • https://static.s123-cdn-static.com/uploads/4502236/normal_600837dfc27dc.pdf
    • https://cdn.sqhk.co/kajipazuto/dkigUnm/11157142301.pdf
    • https://pikowezapuxo.weebly.com/uploads/1/3/2/6/132681044/3414071.pdf
    • https://cdn-cms.f-static.net/uploads/4417315/normal_60607f8c43f24.pdf
    • https://pidumiwululixew.weebly.com/uploads/1/3/4/0/134095913/1965003.pdf
    • https://static.s123-cdn-static.com/uploads/4386076/normal_6005c0a56e6fb.pdf
    • https://cdn-cms.f-static.net/uploads/4375342/normal_603995d82b924.pdf
    • https://cdn-cms.f-static.net/uploads/4413474/normal_601771f7c3d03.pdf
    • https://cdn-cms.f-static.net/uploads/4447108/normal_600fa721a1964.pdf
    • https://cdn.sqhk.co/riketumes/3nicibg/28046303932.pdf
    • https://cdn.sqhk.co/verexoleki/d6h9YHT/cut_the_rope_experiments_poki.pdf
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fee373b89cbc.pdf
    • https://cdn-cms.f-static.net/uploads/4375075/normal_600d9cc5839e9.pdf
    • https://laxefepi.weebly.com/uploads/1/3/4/5/134528647/1973754.pdf
    • http://pogetukexuk.66ghz.com/nezesabesoroxuvikebaz.pdf
    • https://wafilanukeg.weebly.com/uploads/1/3/5/3/135309269/vajikal_fufulason_xomadu_kaletomab.pdf
    • https://seporulakokifo.weebly.com/uploads/1/3/4/5/134590723/gawiwosonidiz.pdf
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/a73909d6.pdf
    • https://cdn-cms.f-static.net/uploads/4426556/normal_6039deee023ab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://naxokagad.epizy.com/be_with_you_2018_subtitle.pdf
    • http://zerakunutage.epizy.com/bullinger_figures_of_speech.pdf
    • http://rugapekazudi.epizy.com/britain_s_got_talent_2018_winning_performance.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_off0001419e.bin
323ec00b6f83bae9a8522f6bd1d900197fbd0493cddcc433a602a7b934d54714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1419E 5524 bytes
font_01_sfnt_off00015464.bin
b7911eaa2140b3302f93f6b25a894b434f1e2fdb66d6f518bad263807332f8f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15464 13448 bytes

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