Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8f777949c68a08…

MALICIOUS

PDF

95.3 KB Created: 2021-09-13 11:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01179dad637642b95ef86b1091516aca SHA-1: 885ed22d3dedff10171453c15d51712b9dd68ce8 SHA-256: 4c8f777949c68a08d9f1f7ce6f97496c1d430b357b70d5ef6e7928b94adfc083
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a link farm designed to redirect users, consistent with a phishing or malware lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=gi+joe+full+movie+online PDF link annotation
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/liwovevagedonozozenepis.pdfIn PDF document text
    • https://virker-ikke.dk/files/40615440906.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130b16be39dd---duvalurativojifiko.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/969227422.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/82009817670.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/duwafodisogoxifopulotez.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/6532225368.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/57852265546.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/rebawotanesevadejif.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/74249064055.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/tavulodamaledinegotuda.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/50365596281.pdfIn PDF document text
    • https://unosms.us/userfiles/file/duvikupoxalol.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/131236258664.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/genatipurijerogejebe.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/82678909725.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14018f2b1---wasovitak.pdfIn PDF document text
    • http://yuli-china.ru/d/files/94836073861.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_105901_3136.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 10180 bytes
SHA-256: f5449a792c0cb346dbe33e139bea4fb74370a240122b526e0b5da7f295c697a3
font_02_sfnt_off00013e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6F 18956 bytes
SHA-256: fabb79c958234de2850b881764e8298bed882224cf2bc949c8d794a206f442e6

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