Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc8a5d3c05212e1…

MALICIOUS

PDF

77.9 KB Created: 2021-03-22 19:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1a83035b830489b4135881bfada55bdd SHA-1: 86916cd3ffc968aba03c47c4d790bf57d463be30 SHA-256: bbc8a5d3c05212e19dd3c5f1e71fc39c588876a2022adecb5aebcefffd051e01
116 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious and phishing-related. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to prompt the user to call a phone number, consistent with callback phishing or tech-support scams. An external URI pointing to 'midufefew.ru' was extracted, which is likely part of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/award?keyword=princeton+review+sat+2+physics+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414871/normal_5fce78f0b4f26.pdfIn PDF document text
    • http://teksalon.xyz/serta_motion_essentials_3_remote_sync626tc.pdfIn PDF document text
    • http://cmb-societe.com/california_physical_science_textbookk54l7.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/difference_between_virus_and_bacterial_cough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_60359b595d1e4.pdfIn PDF document text
    • http://shmelev.pro/106099032832u3ey.pdfIn PDF document text
    • http://myfavoritesun.xyz/red_copper_5_minute_chef_recipesadd4z.pdfIn PDF document text
    • http://bestplacefor.rest/453824590825w1rf.pdfIn PDF document text
    • http://boriroxoxejava.mypressonline.com/como_hacer_un_ahumador_casero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/45661795412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82792b2a-dfe2-4c58-a5e3-11591f79273a/32627813495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0228148f-d394-4fd7-b2ad-09f9144e55cc/colleges_in_virginia_that_offer_mechanical_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/megulonemujevenojojaxejo.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/22161313491.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/96737957335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2938e1a-51a5-4651-a06b-335f708308ae/what_is_the_meaning_of_terminated_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/agneepath_1990_film_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/6795585991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da7b351-a21e-438f-9410-a11e17d24eec/boy_scout_christmas_trees_melbourne_fl.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/zusonikekabe.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/m._a_ka_full_form_kya_h.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 5600 bytes
SHA-256: abe7c19abe542e7137f5e5203da3232b358786dbca3c415907db8d47fbeb4dd2
font_01_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 11972 bytes
SHA-256: a11dbd77b657e91b627139c36933794a8a91bc356847461cd3daff54b0635876

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