Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec2c47875fa6c5c…

MALICIOUS

PDF

72.5 KB Created: 2021-03-28 14:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa501b34b16f2b120212cd81d217d0ff SHA-1: 2edd48823f28c3d39d524dadad3937f714a1c55a SHA-256: bec2c47875fa6c5c038d55d30d68e7878a7c1e105679b09fa193b9cc86def760
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of embedded external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious activity appears to be directing users to external URLs, potentially for phishing or to download further malware. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to exploit users through web-based lures.

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://maypoin.ru/123?utm_term=after+fall+winter
    • http://uspeh.icu/what_are_the_elements_of_photographyhx5eu.pdf
    • http://mon-cmso.best/ghost_rider_wallpaper_gif5n1fe.pdf
    • https://cdn-cms.f-static.net/uploads/4414342/normal_60554bfb3b106.pdf
    • http://copyrightshelpscenters.com/lasubibofumig6wp8.pdf
    • http://uniques.space/30994212109wcnen.pdf
    • https://static.s123-cdn-static.com/uploads/4490122/normal_6000c1a3e951e.pdf
    • http://natlab.ru/combine_like_terms_polynomials_worksheetfynau.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8bbfbdb8-1895-4472-a1c6-9e834ce25a60.filesusr.com/ugd/7deb27_cc799f75ab9f42a59151af4abb11c94b.pdf?index=true
    • https://s3.amazonaws.com/lixasifasi/kawaks_roms_pack.pdf
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_8cef7782181e4ec98bdd2a7fd6963786.pdf?index=true
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_ad45fb5294f2411985dbabdd68e78976.pdf?index=true
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_ff6299ac9607497ea18307a9fb5e3cc6.pdf?index=true
    • https://s3.amazonaws.com/lolijexejomak/p5_kawakami_gift_guide.pdf
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_ecccd7ad0db44d008ac7c96ed88cfb89.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_b8fcfb2064c649bbbf72d67e2c224a7a.pdf?index=true
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_8c22bc313ace4f0db516945e0a2fa5cc.pdf?index=true
    • https://s3.amazonaws.com/ganubifirigevi/sharp_air_conditioner_parts_canada.pdf
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_1f3d081861fd4c7d9b867953efaf269f.pdf?index=true
    • https://s3.amazonaws.com/ximupuv/68399194265.pdf
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_24c93e481d4e4e5ebd0d81539a865a6c.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_off0000e12a.bin
a469df23f090ec34b209bc18dd91e7ffbaefe0be451851846f6dc58fc41e186b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 4664 bytes
font_01_sfnt_off0000f127.bin
15c867b536897ebb47536dd3b3375ec6baa461b86142826aebd441bb38f7325e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10548 bytes

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