Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fd3d77542e980c…

MALICIOUS

PDF

80.4 KB Created: 2021-04-04 13:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7662afe86d1276a3b3e00fffab219159 SHA-1: 76d96261da1fc7e2b0efc9427cb29430d32ce7f5 SHA-256: 42fd3d77542e980cb76d9a85ff750ae5cd601f10db0d50ba19f793cfd83b727c
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL, 'https://bologen.ru/wix?keyword=realidades+3+wava+answers', is presented as a resource for 'realidades 3 wava answers', suggesting a phishing or scam lure. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the extensive linking behavior and phishing pretext indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=realidades+3+wava+answers
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/7378942.pdf
    • https://cdn.sqhk.co/fagaluwozez/NiegfiS/word_bliss_all_answers.pdf
    • https://cdn.sqhk.co/liminekaj/3icgdjf/gamejolt_gmod_fnaf.pdf
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/wokotuxofu_vegeraja_nobitefumafe_bubomevurox.pdf
    • https://cdn.sqhk.co/ragejeli/e6elifA/mowosaketifonubikej.pdf
    • https://cdn.sqhk.co/latosagax/BXiagio/joraxani.pdf
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/1178705.pdf
    • https://cdn.sqhk.co/tozegatopaxu/ghkjaTO/92377856402.pdf
    • https://cdn.sqhk.co/givefugonuw/1hePhbX/58178348082.pdf
    • https://zeleveruki.weebly.com/uploads/1/3/4/8/134898901/bidobumexonukamed.pdf
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/3503361.pdf
    • https://nefarixuk.weebly.com/uploads/1/3/1/4/131407944/wofupewiwada-pixus.pdf
    • https://pekamolotoli.weebly.com/uploads/1/3/4/6/134696990/1377534.pdf
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/7645382.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/465861c8-fbb4-4779-b3eb-a384750b9e73/marbury_vs_madison_key_points.pdf
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_46ff3a3e268340998db392fa6edbf194.pdf?index=true
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_fbf72673db57478f9a29ebb1ecc8b224.pdf?index=true
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_31b99cab87ba4f7991ef96d131fe5d62.pdf?index=true
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_3181c5fc5db34e3b83ebeb477fbe036d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/af3f94be-50db-4185-a5b2-7464f0418bda/xoladixupeso.pdf
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_c80caf4b183b42c98d5c8dd63d046b7b.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fa.bin
51bdc928f1c0b384b5032d7add4dffbc81d44185c2a3ea6e4cf6b5c7258d1939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 5144 bytes
font_01_sfnt_off00010595.bin
6bf84cc180d3dc4e4673937fc29df20913877bc5dab33733fdbc5e4dca72d133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 1848 bytes
font_02_sfnt_off00010e6e.bin
b8ba2583cbdc992095cbfa88b6e2c7cb29ac499a32ed4aef4ff643ce826410b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 10652 bytes

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