Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39462448051ed69…

MALICIOUS

PDF

103.0 KB Created: 2021-03-28 01:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05b722d5ff5fce0ef79f94bd9ca05b3f SHA-1: 786267b3c3ada6a4dc55d8a8a4e81b826d534c1a SHA-256: e39462448051ed69f04233722bc4f214f46905a30873f0b7781496250919c315
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or SEO spamming technique, with the primary URL being 'https://leonvi.ru/award?keyword=rational+function+word+problems+with+solutions+pdf'. The heuristic 'PDF_SEO_LINK_FARM' and ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive linking pattern points towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://leonvi.ru/award?keyword=rational+function+word+problems+with+solutions+pdf
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5fdb7e8d30011.pdf
    • http://woxupepij.iblogger.org/73935348530.pdf
    • https://static.s123-cdn-static.com/uploads/4414164/normal_5fff9bc721179.pdf
    • https://cdn-cms.f-static.net/uploads/4484631/normal_5fe79b8acee39.pdf
    • https://static.s123-cdn-static.com/uploads/4466165/normal_5fdd853a795b6.pdf
    • https://bivojivowuru.weebly.com/uploads/1/3/4/7/134726538/diwufel_rolizezimug_lanesin.pdf
    • http://fozurev.22web.org/65468790779.pdf
    • http://dayzcommunity.info/63127450141rl88d.pdf
    • http://startbastar.online/17066102437xlfcd.pdf
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5ff496a9c8600.pdf
    • http://selectgetc.top/maxixuwejosivakadew7q86q.pdf
    • https://cdn-cms.f-static.net/uploads/4475992/normal_5fe8794cbc6ea.pdf
    • https://fokikemapusa.weebly.com/uploads/1/3/1/3/131398543/77006e.pdf
    • https://cdn-cms.f-static.net/uploads/4369322/normal_605d6bc22240a.pdf
    • https://cdn-cms.f-static.net/uploads/4391340/normal_600a02a7889ce.pdf
    • https://bupogoduvokog.weebly.com/uploads/1/3/4/6/134690502/9945104.pdf
    • https://cdn-cms.f-static.net/uploads/4403541/normal_604ca77b2f6de.pdf
    • https://static.s123-cdn-static.com/uploads/4385434/normal_5fc968783cd9a.pdf
    • https://tebukebodo.weebly.com/uploads/1/3/1/3/131381901/poruxipelopidesibik.pdf
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/vavipujenixobemipon.pdf
    • http://pubgucbayim.com/all_books_by_haruki_murakamiiif94.pdf
    • http://leomannapov.com/kepagezajgi60.pdf
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5ff258990158e.pdf
    • https://cdn-cms.f-static.net/uploads/4469370/normal_5fe90ee142928.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zomimek.epizy.com/15262236395.pdf
    • http://xaduwefel.rf.gd/51587182181.pdf
    • http://dumumuvuxu.epizy.com/foxizulepiwoleb.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_off00014e39.bin
c7dd3f17f49ab2baa0b82c07889a767f7ec6dd409add523996c1d4e98c533acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E39 5636 bytes
font_01_sfnt_off0001614b.bin
d27dfc0651810ef644a7b53ca5daf96ae736d4586c3ec0939891cab2acd8559b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1614B 12880 bytes

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