Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf3ef463ce6b89c…

MALICIOUS

PDF

71.7 KB Created: 2021-03-17 13:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: afb71e8777991fac47f930d6d2476495 SHA-1: b2483c2ecc51ae35395a804ed93763d420474378 SHA-256: dbf3ef463ce6b89cb0b1eef7794c54d8cfcc54346990be06997ef52b09625e12
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document body and extracted URLs suggest a lure related to 'job simulator apk quest', directing users to external sites that likely host malicious payloads. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt.

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://kuzutuzo.ru/wix?keyword=job+simulator+apk+quest PDF link annotation
    • http://mbfsopg.com/watch_andromeda_strain_2008_full_moviep77uj.pdfIn PDF document text
    • http://egrn-order.online/dnd_5e_handbookg1bco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407813/normal_5fec67d3d4ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_602a78b061533.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/adding_and_subtracting_fractions_with_like_and_unlike_denominators_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_60123e4608bcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_601dfb080d9f3.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/infinix_note_7_phone_price_in_kenya.pdfIn PDF document text
    • http://navalny.design/53121826267p0ep0.pdfIn PDF document text
    • http://numulul.mygamesonline.org/89240241602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_603f1439c70da.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/3166b563-02db-4745-a843-80e38a6c7248/zotumuxupopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d513580d-00b8-466e-8a3c-81da628f157b/zupegejowolulemojoxurave.pdfIn PDF document text
    • http://kedaxesipuwid.epizy.com/jagopenomajuranobemodixe.pdfIn PDF document text
    • http://lexekuduwowig.atwebpages.com/public_relations_activities.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/best_electric_pool_heaters_for_inground_pools_reviews.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/zejap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec62470-d4d9-4736-aef2-cd92e54feb26/niwovowetebemamatefiwife.pdfIn PDF document text
    • http://pitolujebenim.epizy.com/bogalotudijigo.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_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 5284 bytes
SHA-256: 623d014b50ae19bdb49f1433381f241f271d517ab60d94d0e2dce30ec15d298a
font_01_sfnt_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 11856 bytes
SHA-256: d851719e52d884200fadbd7118b7f72a38c8eb872063abb7a3f7fb2a2d234539

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