Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3be7dd51e17208…

MALICIOUS

PDF

94.6 KB Created: 2021-03-11 10:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ba0c82708ba2ffb4061a315e1193e4f1 SHA-1: b28dfa11dadb4217e0dc8d7697ecee5a37c8b179 SHA-256: 7b3be7dd51e1720850672c99bb9c708f32f184f7834bcd42f52471934a34601e
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which points to a domain associated with malicious activity ('druttle.ru'). Heuristics indicate the PDF is a link farm on disposable hosting and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though partially corrupted, suggests a lure related to a 'Massachusetts driving manual practice test'. No scripts were extracted, but the overall structure and URL suggest a phishing or malware delivery attempt.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/wix?keyword=massachusetts+driving+manual+practice+test PDF link annotation
    • https://porilijure.weebly.com/uploads/1/3/1/6/131606314/fizadibodapado.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/iaCgi8O/need_for_speed_most_wanted_2012_soundtrack_mega.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/Z8Tihjj/kuvidomotifupusubapi.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/giIMhgR/knife_dash_mod_apk.pdfIn PDF document text
    • https://lawuzifelive.weebly.com/uploads/1/3/4/0/134041442/2536488.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/how_to_light_advent_candles_at_home.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/49140146418.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/56775879113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b2c9b983-b5ae-461b-bad6-ff4eaef574a7/how_to_protect_from_identity_theft_online.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_d97eca633c1340908229f11b261582cc.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_53ed76f7d3a446ba90895a25469e263c.pdf?index=trueIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_477566bd0b90400f970fd41bd9c43aea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/wowujobipojifupawosazuxif.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/1584512057.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/pevolofit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c065a56f-c4fd-46af-b3f6-d070cadb7c2f/hayward_chlorine_feeder_cl220_leaking.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_965ca10de35a478f887fa1c27a691ec4.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 5324 bytes
SHA-256: 8f112e2e957eed2f33a201cdf2c0e1a814ae1811f78010604787ec7ec82467cd
font_01_sfnt_off00013ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD4 10652 bytes
SHA-256: 2bbaea6e0cc0bc2f44dc9c0c2091f2f464d178b045f42200000b03815f29413f
font_02_sfnt_off00015f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F20 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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