Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3de7f2b001692d…

MALICIOUS

PDF

67.4 KB Created: 2021-03-29 23:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 93813137a5701380028d839602cf31ff SHA-1: b9d5958d725e689fa59b7408ce214f4c61bd1ece SHA-256: ac3de7f2b001692dcefeaa3426c220b1ac5156dede47bc38ca87c5af782ba32d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable domains and are disguised with terms related to popular media, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://mezovuduw.ru/123?utm_term=babu+bhaijaan+odia+movie+song PDF link annotation
    • https://bomosaxume.weebly.com/uploads/1/3/4/8/134892214/lixiwivubolixutudeze.pdfIn PDF document text
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/poputevugenosid_zokezaw_sokelevezozovav.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedevatas/c0iextb/26995440643.pdfIn PDF document text
    • https://xuzijobozu.weebly.com/uploads/1/3/1/4/131411245/179455.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/ib8Nia3/tovala.pdfIn PDF document text
    • http://lnstagramverifycentre.com/rafuwugumopawemuzurekims9eln.pdfIn PDF document text
    • http://serarudipiwuvon.mypressonline.com/tenexavu.pdfIn PDF document text
    • http://dreamingdeveloper.com/106210890198shvh.pdfIn PDF document text
    • https://cdn.sqhk.co/mudaxomemut/fNhaVfZ/carnival_games_rental_las_vegas.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/3b1b1f8d55f9e5b.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/dhfgen8/edge_lighting_led_tape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede19d29-9932-4f9e-a9d0-5db832c3ddd1/sex_education_show_on_netflix.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/adding_and_subtracting_fractions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26012941-e256-4452-966d-b04d25c7cc51/gexofumiwaxixosis.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/cadet_college_larkana_admission_form_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/how_do_i_sign_into_my_google_cloud_account.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/sexemetaxon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26715ca-0aa9-43d4-8406-0cc80600bc6a/how_much_does_a_senior_electrical_engineer_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5d7be3-0631-48c1-a33c-74ef3d9f37a0/jabilavakibod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884d800c-3e8c-4d85-af3a-d87c639b012f/nuwifefidogeruke.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_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 5436 bytes
SHA-256: c35f1a14aa43c24c09a02fb713c65560c5457b344649769f3e4cd61a206f3943
font_01_sfnt_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 9700 bytes
SHA-256: efa1302c28aeebfff2885fc662205af3f38076ede80f3da95c979cfc621501f1

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