Malicious PDF — malware analysis report

Static analysis result for SHA-256 210d617d792ac511…

MALICIOUS

PDF

82.3 KB Created: 2021-04-08 08:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 499444baa6e7ad73bbc41176c9a033df SHA-1: 9bd08ce43a3c42a9bf6faa72c8b613fcd68a2ce7 SHA-256: 210d617d792ac51126efa3dd62fc0b822e0643cd2717c821e5e198a5007f295e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, with a high-confidence heuristic indicating an advance-fee scam lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external URLs points towards an attempt to redirect the user to malicious content or phishing sites. The primary IOC is the external URI pointing to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://pelibifir.ru/123?utm_term=leigh+guided+busway+stops
    • https://zakikubefetopu.weebly.com/uploads/1/3/2/6/132696201/9795840.pdf
    • http://farusagomuwig.iblogger.org/49859176491.pdf
    • http://jidokove.scienceontheweb.net/vuditup.pdf
    • http://zegererevez.medianewsonline.com/the_customer_centricity_playbook.pdf
    • http://fazoluniguket.iblogger.org/37478346792.pdf
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/risetikifo.pdf
    • http://zakosemej.mypressonline.com/folomegaferuxiferelaxek.pdf
    • https://nefotinabe.weebly.com/uploads/1/3/5/3/135314884/zosavipasamosizejik.pdf
    • http://jopulemasawo.22web.org/computer_programmer_jobs_from_home.pdf
    • http://kisiguvawatabom.22web.org/79865140362.pdf
    • http://besemafobekilir.22web.org/kant_critique_of_practical_reason_cambridge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://biwefejiza.myartsonline.com/zokagipejebijixumeruf.pdf
    • https://uploads.strikinglycdn.com/files/858c12aa-25fa-47ce-a6e4-c5f9d4158f99/vagabakovobugobupuf.pdf
    • https://uploads.strikinglycdn.com/files/54f02112-b1fe-4f7e-b281-cb56b3122636/how_to_do_ratios_without_a_calculator.pdf
    • https://uploads.strikinglycdn.com/files/ea90c02d-959a-4325-b6d1-a5d3a7a87790/how_to_do_a_fluency_assessment.pdf
    • https://uploads.strikinglycdn.com/files/e8e80801-1a23-4bc1-8358-64529fd3a10d/48204639615.pdf
    • http://koxevopigi.epizy.com/71659643608.pdf
    • https://uploads.strikinglycdn.com/files/d98a8f45-5991-4b22-835e-6f79cd58550e/subatedirivenipugepero.pdf
    • http://gumubagigafaj.rf.gd/30624439093.pdf
    • https://uploads.strikinglycdn.com/files/b977eb1f-019e-456d-8784-9287cf60d1c6/kiwelowujubozogunax.pdf
    • http://tizeruxabono.onlinewebshop.net/inorganic_chemistry_pw_atkins_download.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_off0001047b.bin
ac1407196ab17e886148291488ffca5c441fdb7fe1aaef2840f5c77a657a6391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 5368 bytes
font_01_sfnt_off000116d4.bin
82069b37adce4f681af98d3a02da95b152c0fb1525dc6860db8e9b34b6d4c06c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 10944 bytes

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