Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c61cb2b91b9f5ab…

MALICIOUS

PDF

75.9 KB Created: 2021-05-11 23:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8af3c8f8ebc743666a19376f73a775f SHA-1: 5bd892926a906da10041d89f277733d094cc1b24 SHA-256: 7c61cb2b91b9f5abc839086f3ddf286522e4c3830033efe84d705270aa23fb60
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an external URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, likely using embedded JavaScript to facilitate the redirection.

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://druttle.ru/strik?utm_term=thermo+fisher+isotemp+freezer
    • http://toolsbestpricemicrometer.site/how_to_trade_bitcoin_youtube2vin4.pdf
    • http://mylevel.store/24451243749jkvee.pdf
    • https://cdn-cms.f-static.net/uploads/4465249/normal_6068b9b48b0b8.pdf
    • http://parrrtner.xyz/wirupatuperanevo9e6ku.pdf
    • https://cdn-cms.f-static.net/uploads/4409102/normal_600b4bd7ec34c.pdf
    • https://cdn-cms.f-static.net/uploads/4489241/normal_602ec2e4720ce.pdf
    • https://static.s123-cdn-static.com/uploads/4449424/normal_600644827e02f.pdf
    • https://cdn-cms.f-static.net/uploads/4388608/normal_605c5b6f69851.pdf
    • https://cdn-cms.f-static.net/uploads/4461497/normal_600b8fea5f117.pdf
    • http://kuvezowepo.scienceontheweb.net/13125427124.pdf
    • https://cdn-cms.f-static.net/uploads/4392470/normal_606447fcf178d.pdf
    • http://vukuradi.mygamesonline.org/the_bands_of_mourning.pdf
    • http://vezerfa.xyz/walmart_grocery_promo_code_nov_2020trb1o.pdf
    • https://cdn-cms.f-static.net/uploads/4475985/normal_600b17ba7b28d.pdf
    • http://copyrightsafetyhelps.com/unabomber_manifesto_downloadh9nmj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d1c00a7-cc20-4842-a9ae-5066d469c4f7/xirisigiwenaxax.pdf
    • https://uploads.strikinglycdn.com/files/95171875-6b0a-4efe-9d3a-1878a642f7ed/my_hp_stream_11_wont_turn_on.pdf
    • https://uploads.strikinglycdn.com/files/f29080e9-9b4f-48c9-b6fc-6857ecbb35c3/fuvazagijexodemiwe.pdf
    • https://uploads.strikinglycdn.com/files/7caa027b-d2c6-4a22-a4f2-1e2844058a97/dukijabomavonuvu.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_off0000eb80.bin
8181300ea009656221933561ce7822bdee2704c6d757c2a412a8d602150ef937
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 4896 bytes
font_01_sfnt_off0000fc08.bin
92fc22431ee877d3a8c9b7f09ca216537c86046238aba146b3fdee7d8000a940
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 10828 bytes