Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bdd88b9d53b416…

MALICIOUS

PDF

87.2 KB Created: 2021-03-17 12:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1937817cafa681d1536b92f802c231ee SHA-1: b9a0dc06dfdc479fbe8a7c0276b694010169f39f SHA-256: 38bdd88b9d53b41669758b327fcc7333cb43c1c9ddfbf51bec87cbc77c0d4730
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The embedded URL 'https://golowaki.ru/123?utm_term=latest+android+mobile+phones+below+30000' is likely the primary lure, disguised as information about mobile phones. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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/123?utm_term=latest+android+mobile+phones+below+30000
    • http://xepuxupipe.mywebcommunity.org/sakalod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://biwefejiza.myartsonline.com/diy_face_mask_printable_pattern_free.pdf
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_4f616a23f1bc4dabb0560ef1113b6aa9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ee55f230-c3cd-4b39-bd05-fe51a4402061/judone.pdf
    • https://s3.amazonaws.com/somamere/nelinipanaxagomoki.pdf
    • http://refusunono.onlinewebshop.net/zorivamenuxexumobi.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_069a3b231dd94eeaaf0891e9f272f71d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab5ed9d1-c674-4251-87f9-1fcb01ff567f/watts_premier_5-stage_ro_replacement_filter_pack.pdf
    • http://pebomotixot.myartsonline.com/an_inspector_calls_full_movie_2017.pdf
    • https://s3.amazonaws.com/mamibis/osrs_beginner_clue_scroll_answers.pdf
    • https://uploads.strikinglycdn.com/files/86869636-fffb-4a35-91cc-afa10c041ce1/lanerokiboveruwegude.pdf
    • https://s3.amazonaws.com/jifesu/military_in_any_way_shape_or_form.pdf
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_857a778808f745b8adcd18af57abe583.pdf?index=true
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_1353653d7b684e26bb3e26e7a2aea211.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dd99a82b-c436-47e1-a3f1-66322384a55a/rovutavozepunupoz.pdf
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_29777652dde54c4781be78f76fa18c66.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aa0549df-c1c9-4511-9d53-6f1f6086366c/is_the_ford_crown_victoria_a_good_first_car.pdf
    • https://uploads.strikinglycdn.com/files/7c75a43d-2c24-43e2-93c7-817459d128a7/el_juego_del_angel_libro_completo_gratis.pdf
    • https://uploads.strikinglycdn.com/files/b3fc0300-d260-4579-8df6-52e8a636f92e/73913628862.pdf
    • https://uploads.strikinglycdn.com/files/8c76a08a-0cb1-4ab0-b197-d7b34974fe6c/10845733595.pdf
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_ab244c04450a4f618fd14fd1440cbf5d.pdf?index=true
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_40c43900267c4fdd95efa04b1773f589.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_off00010962.bin
a402cd3444b666b6c525bdbc4c799bf39ed5aefb0fed93fcf00a5f3ef47bc05c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 5468 bytes
font_01_sfnt_off00011bca.bin
01f71fb4a30436eaeb51508e10992ba45d900df5e47be65825fb5f186bcc0fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 10928 bytes
font_02_sfnt_off00014121.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14121 4324 bytes

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