Malicious PDF — malware analysis report

Static analysis result for SHA-256 995832665a032ba2…

MALICIOUS

PDF

88.4 KB Created: 2021-03-15 06:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ac556a8ba5687c63979f720372b597fc SHA-1: 6adde0c47dd9b34a13d2bfe9567b9b116853a092 SHA-256: 995832665a032ba22b7c95e700577f9301cbf6502b2d1ea5770d9b6867f20675
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan. It functions as a link farm, containing numerous external URLs, many of which are hosted on disposable domains or use UTM parameters, suggesting an attempt to obscure the true destination. The primary lure appears to be related to 'Photoshop star brushes free cs6', likely a deceptive tactic to drive traffic to these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://lozipotod.ru/123?utm_term=photoshop+star+brushes+free++cs6 PDF link annotation
    • https://cdn.sqhk.co/gafisasiwu/z6hduiC/cake_designs_simple_for_birthday.pdfIn PDF document text
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/670883.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/99346722663boktx.pdfIn PDF document text
    • https://cdn.sqhk.co/rovukupovumo/hdrjfqs/cara_buat_google_form_dari_hp.pdfIn PDF document text
    • https://cdn.sqhk.co/semexixok/gjggjj9/76317400806.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/7c6d5.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/cSOifjf/jomagazewur.pdfIn PDF document text
    • https://werobezukivipa.weebly.com/uploads/1/3/4/3/134337965/820736.pdfIn PDF document text
    • https://wemivera.weebly.com/uploads/1/3/4/3/134311686/satowizujaxojok-tajexotipibaxo-mepazakatabo-nuleve.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/pisezezubobogu.pdfIn PDF document text
    • https://bugagage.weebly.com/uploads/1/3/5/3/135330359/d95e7c9f10af0a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487201/normal_6000438f21017.pdfIn PDF document text
    • https://sonefexezeripu.weebly.com/uploads/1/3/0/7/130739000/murivoxikuzoj-nifine-kowazere.pdfIn PDF document text
    • http://arfesopt.com/does_lowes_sell_real_john_deere_mowersx8rxg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_5fd95ea4c965c.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/bavufekazotumu_govumid_kubarefamupo_pifavidanoja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fd048e5c4a88.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/hd7zXk8/forma_corecta_plural_chibrit.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/bejobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_600c7d3cf1e97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_8a6a9009610245a4bbf2ded5a46a1d8e.pdf?index=trueIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_de82fe2250964e4b8cb20083b987499b.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_a76f316d101a40d0b3ad8f1c813ad3e3.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_ec15d9e903d54b6e9cdc0657382212aa.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_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 5364 bytes
SHA-256: bf627e664b243725f3457d11fb84b0ea1d2fb6c32b42672ae1adce163401791d
font_01_sfnt_off00012e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E68 10904 bytes
SHA-256: 7f57fceea132b091f5d361a56cb0dc3498254ebacd0b4c2cc423b3da5fefd10e