Malicious PDF — malware analysis report

Static analysis result for SHA-256 d898e6498fda9f6a…

MALICIOUS

PDF

234.2 KB Created: 2021-05-24 11:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 40dc820ece2784b45c2bbdf47fe6fdd5 SHA-1: 20b25484ab476648cd2c12f945d40974c2ec29db SHA-256: d898e6498fda9f6a8c73900d28858c664c139171d976f74cfaa9f80adcc03a83
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The embedded URL and the high-confidence ML and ClamAV detections strongly suggest a phishing campaign. Although no scripts were explicitly extracted, the PDF structure and the nature of the lure point towards a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/strik?utm_term=justfab+jean+size+chart PDF link annotation
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/df31c644d02d.pdfIn PDF document text
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/8618804.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444874/normal_5ffe748484bb9.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/vezipukaduj-gevago-pedokurimazi-pibijuxefolef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470685/normal_606c61b752d1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421038/normal_5ff585ef51923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_6038df675ae1e.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/mudurixo/kosikazigivolun.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/booth_wise_election_result_haryana_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd257cf0-1bdf-4b35-94fe-c85c1ab57f4d/new_races_warcraft_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/68274227911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81a9253-d416-4ce6-be1c-08b84100eaa8/is_there_an_app_for_walmart_grocery_pickup.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/c_a_f_police_ka_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c580793d-4e3a-41df-8b81-e1262b5d52b9/88596675619.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/marvel_studios_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/pesulopapitujo.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/nusoludatitivo.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/9223102149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbe3ffc-9daf-4756-8392-4d8728884ad1/resoposilanesox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2df483-e9ab-4da6-b49a-ef19f46cc807/possessive_adjectives_exercises_for_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/tugupuxosa.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/mirae_asset_mutual_fund_sip_nach_form.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_off00035cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35CAC 5192 bytes
SHA-256: c3fff32407fca803d62f20a57e65bebca7fe98d1f0abfbc995ddc0e043ccea6e
font_01_sfnt_off00036e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36E60 12748 bytes
SHA-256: 1dce72e4fa48184c766d7bee6f20d382950ceac66990440e91723270de668888