Malicious PDF — malware analysis report

Static analysis result for SHA-256 74337aef46d93d85…

MALICIOUS

PDF

78.9 KB Created: 2021-03-23 19:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92ffd749b849f0cbf2843f4c10f45617 SHA-1: 9f0a8497e6520a7e71708259c53c98f1d1ab9c05 SHA-256: 74337aef46d93d85c059d9b7badeed89e50d0fc19100cd511e8f5dc29809a74e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=measuring+up+express+answer+key+level+e'. This URL is the primary indicator of malicious intent, suggesting a phishing or malware delivery attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=measuring+up+express+answer+key+level+e
    • http://nisekuwodixuv.22web.org/61093248352.pdf
    • http://jimubezisu.iblogger.org/lujivizimovuwumute.pdf
    • https://tulosiwawi.weebly.com/uploads/1/3/5/3/135326734/5218535.pdf
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/3887459.pdf
    • https://tavoledunu.weebly.com/uploads/1/3/4/7/134708600/9300839.pdf
    • http://nilutafejo.mypressonline.com/dugumusadegize.pdf
    • https://xelexezeni.weebly.com/uploads/1/3/0/7/130740222/forasimakorewo.pdf
    • http://bibuzikufaje.mygamesonline.org/tork_1109a_timer_not_working.pdf
    • http://rulazix.iblogger.org/gartner_artificial_intelligence_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mududexabaxame.epizy.com/50062933577.pdf
    • http://baxovebiw.rf.gd/45574819549.pdf
    • https://uploads.strikinglycdn.com/files/1c40dcd6-4fcc-472c-aa10-4b7bede6bfca/kenmore_ac_remote_not_working.pdf
    • https://uploads.strikinglycdn.com/files/51b0d485-d369-47fe-8b86-9f3df20fcc10/poor_mans_james_bond_2.pdf
    • https://uploads.strikinglycdn.com/files/f55843c7-5bb6-41aa-8214-d1446ac64f2b/how_to_program_nec_phone.pdf
    • http://kajomeki.epizy.com/dononojolanelogitikine.pdf
    • https://uploads.strikinglycdn.com/files/0c19c04a-42e7-460d-b165-88304c5f1179/vermeer_bc1000xl_torque_specs.pdf
    • http://fazaburifug.myartsonline.com/icao_annex_10_vol_1.pdf
    • http://vodukipezep.rf.gd/japokubukizekase.pdf
    • http://lekukulefu.epizy.com/mecanismo_de_accion_de_los_antihistaminicos_h1.pdf
    • http://kimajuj.epizy.com/benipejiwobuno.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_off0000f288.bin
5a48a8731c89076a53d8ba9cbcad9c086c408aab268bebdd27ca12c1b0140815
pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 5376 bytes
font_01_sfnt_off00010510.bin
f65af638014f9187b43f276f00b406d4deebba16bb7b2d7a5e2b8235f557a513
pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 12068 bytes