Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c527842c23bbda…

MALICIOUS

PDF

92.4 KB Created: 2021-04-05 11:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a72f58d7ca320f154193fd44bb85f6e1 SHA-1: c4aa5cb86c8f206a547a3e6e55603b89e2258e3e SHA-256: 43c527842c23bbda7f520c50e54bf6c351eab2e438e1708685a731876bc35a89
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to deliver a malicious payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://crophysi.ru/123?utm_term=s3+bucket+cloudformation+yaml
    • https://cdn.sqhk.co/lomuwomigez/jejfpjd/52397344606.pdf
    • https://static.s123-cdn-static.com/uploads/4391335/normal_60064bd4eb531.pdf
    • http://hyipinvest.site/sony_wireless_headphones_mdr_zx770bn_manual3srad.pdf
    • https://cdn.sqhk.co/vizelupavew/BVicig6/real_talking_parrot_price.pdf
    • https://cdn-cms.f-static.net/uploads/4382186/normal_602a219f5e9d9.pdf
    • http://rodina38.ru/suwojakutepomabanexosejiwgcy8.pdf
    • https://static.s123-cdn-static.com/uploads/4407664/normal_6006c7c1bafef.pdf
    • https://cdn.sqhk.co/goropakuvoge/Zj9jjjc/online_auction_websites_for_nonprofits.pdf
    • https://cdn.sqhk.co/nufomewo/gfRgdMs/69717892716.pdf
    • https://cdn.sqhk.co/ranemagesoga/hjid9gi/zepenavibazaguviratusigof.pdf
    • http://hallop.xyz/how_to_learn_web_design_for_beginnersl5kio.pdf
    • https://cdn.sqhk.co/reriwoduriju/gLngcgg/best_3_point_shooter_in_2k20_all_time.pdf
    • https://cdn-cms.f-static.net/uploads/4388820/normal_60570ad38b820.pdf
    • https://cdn.sqhk.co/kekoseni/fjglk7a/table_tennis_rules_serve_fault.pdf
    • http://regsenatvumen.website/master_cleanse_livropmi7b.pdf
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fe63be30905c.pdf
    • https://static.s123-cdn-static.com/uploads/4488335/normal_5ff58e6e561bb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00012c0f.bin
b4e89085e7e73fee340a472b48bf1600216e19d2b5935f0d613f58ac00651024
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 5560 bytes
font_01_sfnt_off00013ef0.bin
78d724920b0b8d9b9185c10b7cf447e17043871a597e106bbd7fc02b05651c64
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF0 11064 bytes