Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd7f1450648c43c…

MALICIOUS

PDF

78.7 KB Created: 2021-04-02 06:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46676a87a1be5f77d5c0a3fbafb52f6e SHA-1: 1c5aeca56ee9988b3dffea58b2d8086760fda4a2 SHA-256: bdd7f1450648c43c51364a6ddce2c6c19d4242d30e671926e69323c7db8474bf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to 'resalured.ru'. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The document body, though partially garbled, suggests a lure related to 'public relations success', which is likely a pretext to direct users to the malicious link farm.

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://resalured.ru/aws?utm_term=how+to+measure+public+relations+success
    • https://static.s123-cdn-static.com/uploads/4369518/normal_5ffcba8e7f533.pdf
    • http://tersq.space/analyzing_human_pedigrees_worksheet_answerstq8lh.pdf
    • https://misirukizos.weebly.com/uploads/1/3/4/0/134017349/wonifitirokavu.pdf
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/bimifo_wewizati.pdf
    • https://kabigupux.weebly.com/uploads/1/3/4/4/134442156/c79252a73d1ab.pdf
    • https://poroxokinawutaj.weebly.com/uploads/1/3/4/5/134507376/4ca9313.pdf
    • https://cdn-cms.f-static.net/uploads/4427080/normal_602ecdeeb30f4.pdf
    • https://cdn.sqhk.co/libigekukaru/jmjjYPV/wow_classic_druid_resto_leveling_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4391327/normal_602f626fa3e05.pdf
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/36ec436085f.pdf
    • https://cdn.sqhk.co/xuzodidudi/RwO3Cii/buravujoburuneroropinoji.pdf
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/gejesinigosafek.pdf
    • http://topstop.site/darkness_rises_gear_guidel71xu.pdf
    • http://s7hmus.org/bbc_news_bohunt_school_uniformxffcr.pdf
    • https://cdn-cms.f-static.net/uploads/4380869/normal_602a215a0d223.pdf
    • https://cdn.sqhk.co/kafufojugure/h9ghja1/47788561754.pdf
    • http://ig-socialmedia.xyz/35806679354sfbgq.pdf
    • https://zubowosusotikip.weebly.com/uploads/1/3/1/6/131637009/c2d93d2b60eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9077b78c-65ff-433f-9075-81ac5e137d6a/how_to_change_wii_to_hdmi.pdf
    • https://uploads.strikinglycdn.com/files/da188c1c-e902-4710-97ab-5e6b91349b0a/1668986200.pdf
    • https://uploads.strikinglycdn.com/files/71917091-8e4e-4d36-a4ad-aec4c4d9d66b/tusivufuwafotaxufuden.pdf
    • https://uploads.strikinglycdn.com/files/49877737-38a8-44a5-aa4c-2aa8809029da/burger_king_food_ingredients.pdf
    • https://uploads.strikinglycdn.com/files/c5ca547c-c5d5-476c-877f-9de9ef547ba4/87528599216.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_off0000f705.bin
78c768a0cc71c665ecbc6d21e247335eb39bfb24cfb38582287499607931de64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 5272 bytes
font_01_sfnt_off000108e0.bin
6fb11b911da622aea2e0a1637253df34570e429eca0a7ef4d3584f390ad228b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 10716 bytes

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