Malicious PDF — malware analysis report

Static analysis result for SHA-256 33acf30131bf07f5…

MALICIOUS

PDF

99.1 KB Created: 2021-04-18 13:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2493834e8d865bccd51058b8bf9ca6ab SHA-1: beb587a1b4d485759dfc91dd08cd99edb359172a SHA-256: 33acf30131bf07f551b0a286500c4407837e9b3b8f07d6f0199fa1b038324553
146 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic detections indicating it is a link farm and potentially a phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the overall structure and URL usage point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=pantum+p2200w+wifi+password PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425723/normal_6047f36ae0e46.pdfIn PDF document text
    • http://sizegivip.22web.org/apasl_2019_guidelines.pdfIn PDF document text
    • http://fagixadako.iblogger.org/50235645141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_600e464ab13c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_6066178b1f56c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494147/normal_604a5f7f92424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2834d5-c289-4b7b-82e7-f431af8e9f0c/mibovikoteviwoka.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_45595d2637c24ece98bfb10203aed978.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/47648889712.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_c5ee1f6a3ba849bfa100a3fea907cb04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1da412-2389-49b4-b060-7d30a5a7c260/where_to_get_a_covid_test_in_dc.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/how_to_see_google_play_search_history.pdfIn PDF document text
    • http://nosijatigatu.epizy.com/nulebele.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/72836856023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23560958-10b6-407b-9fb5-f37a37c55a1a/the_elisha_list.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_abb55aba94b04e26bdbd42fba0590990.pdf?index=trueIn PDF document text
    • http://sabaxop.epizy.com/72750701580.pdfIn PDF document text
    • http://zovixiluru.epizy.com/67198507468.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/is_the_shining_available_on_hulu.pdfIn PDF document text
    • http://seduwivita.epizy.com/xugabulikutebubiget.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_5f88e3c761c1442b8407d0c4dc2f44db.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_d23a0c02f0af428fb11760a85094b3c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/commonwealth_of_mass_nonprofit_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65883213-ddf6-47eb-a5a8-0661f75a269c/norcold_n611_not_getting_cold.pdfIn PDF document text
    • http://rorodev.rf.gd/how_to_pair_dell_wireless_keyboard_and_mouse.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 3512 bytes
SHA-256: d1de5f72182be78c09aefd487f86d4ecb9f51103bea0a2d9a0ba67d2065d1d88
font_01_sfnt_off00013f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 5524 bytes
SHA-256: c38825d9bf3b0402a3929565d8f49788ff9aa44eff5dc36e9948498e21b20982
font_02_sfnt_off0001523d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523D 12920 bytes
SHA-256: fdb3ccf8ceccda1abcde108901d995377a596a4be94106ed4e18caedca9ae49b