Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0ea7f81544072e…

MALICIOUS

PDF

74.6 KB Created: 2021-04-29 20:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77b6b33eb55ee29dee33c0a733c4bc7d SHA-1: 769c6b78f8100fc76e70db6f64b441f277af0c99 SHA-256: 2c0ea7f81544072ee6d40fbb8198b118d28e92125720aea29353f5731864ed86
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. While no scripts were extracted, the presence of external URIs and the overall detection profile suggest a phishing attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=netgear+n600+no+wifi
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/nikakufedokaru.pdf
    • https://cdn-cms.f-static.net/uploads/4498983/normal_5fd3aad31bcf6.pdf
    • https://cdn-cms.f-static.net/uploads/4472760/normal_5fd1264aeca3f.pdf
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/vovemitonivuxukofak.pdf
    • https://mesoxofag.weebly.com/uploads/1/3/4/3/134314287/a2f531acbf19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/74973313-bf64-44d3-be97-b099d13ed75e/is_it_hard_to_learn_3d_printing.pdf
    • https://uploads.strikinglycdn.com/files/2520dc3c-ebbb-4130-976e-4fa44e97afe1/zedatejemojafokowogipe.pdf
    • https://uploads.strikinglycdn.com/files/221be49e-cd71-464f-8851-dffaf26e7722/jp_morgan_capital_market_assumptions_2018.pdf
    • https://uploads.strikinglycdn.com/files/0b8db8be-e4ba-4888-8b08-0074adb65e1d/how_do_you_reset_a_sansui_tv.pdf
    • https://uploads.strikinglycdn.com/files/229d8645-8eef-4af6-a22f-18260ca84310/ruzofurexiboxugatibubuv.pdf
    • https://uploads.strikinglycdn.com/files/bc81a033-5fec-417e-956b-c6e4cb3cd48a/a_long_way_down_film_music.pdf
    • https://uploads.strikinglycdn.com/files/21a76506-d80f-46ae-83be-01025946afee/phonetic_sounds_of_english_alphabets_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/d22c7618-d671-4bd9-9e03-c6a7ffa535f0/is_it_illegal_to_live_with_someone_and_not_be_on_the_lease.pdf
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_10877a8133fe4308a558b49a296be6f8.pdf?index=true
    • https://s3.amazonaws.com/julaxel/20690453964.pdf
    • https://s3.amazonaws.com/farefasejikap/pedasatigodeto.pdf
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_f5dc91b0895146cf8c43081dd3403808.pdf?index=true
    • https://s3.amazonaws.com/sinamozagemoger/dry_cleaning_app_template.pdf
    • https://s3.amazonaws.com/pipaneku/zidoo_android_tv_box_x10.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_b743bf625ade42058e0cd90a425123f3.pdf?index=true
    • https://s3.amazonaws.com/gezetega/bpce_sa_annual_report_2018.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_off0000e8e9.bin
52b5c3bd1108441f908417eb748eba09f019ee6580b00f5a38b144e444e7c52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 5080 bytes
font_01_sfnt_off0000fa5c.bin
8019d94b03199de23dc68c928ef013ecf923bb2c84c323b5b01796aa9bcf62dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 10336 bytes

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