Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbbb817d1264de3…

MALICIOUS

PDF

86.8 KB Created: 2021-03-22 06:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a2d2a7f98fd748c61033ab02aa1b66a9 SHA-1: 58331bd6e4ba896c71743a2b5dd10ce56c6ad51a SHA-256: 7cbbb817d1264de33e7bb6e91ace77abe92bac0cd3c1c16ab7e9a198dc844020
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/123?utm_term=good+graphic+design+pdf+portfolio+examples PDF link annotation
    • http://sdl-trade.com/76325578200dzu10.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/96528274559.pdfIn PDF document text
    • http://gdztut.com/87463063949z9kly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_60533c9d35284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_605421b7c8bc5.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/microbiologia_veterinaria_nestor_stanchi.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/contoh_amdal_pabrik_gula.pdfIn PDF document text
    • http://kifevoliga.iblogger.org/deep_learning_book_free_download.pdfIn PDF document text
    • http://smilex.club/tojaxebunusobc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pemeromerap.rf.gd/96991169660.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_b83cd93bbee1457d8758b95a2c979328.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_e65aacd11ce94b558511b2ecfae263eb.pdf?index=trueIn PDF document text
    • http://kakapefetabol.rf.gd/lamumaxegiwaxob.pdfIn PDF document text
    • https://451cdc1f-766e-44a1-8a9d-f9db2ecad5ed.filesusr.com/ugd/0f0d48_398c91df42b140efbd70f7142cd803b0.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_7b15f3e92516414dbb6aba4b01d3bc1b.pdf?index=trueIn PDF document text
    • http://tulakitukubipi.epizy.com/platform_bed_wood_king.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_1e75217eba474f4986b333f8a518672e.pdf?index=trueIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_54ebceb4b18a43048153695987492f61.pdf?index=trueIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_bb94c3ac4e004ff1967b2cb765bbc4df.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_1762dca096e042f1a3e006b5ff3f2f4e.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_81d75b19992f45fdbe5de4c94ebdc29a.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_07be5a2a35684ab88e1c34706e1c09e2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 5668 bytes
SHA-256: d42bd45c6275ad403a2d92eb205e118c4c918a66b3a54b05121160d5bf6d7eb0
font_01_sfnt_off00012935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 10740 bytes
SHA-256: 5b7128f260c55ea8a14de1aa6b0cf1bfe16eb02bb7a346ba32556e3b33274a00