Malicious PDF — malware analysis report

Static analysis result for SHA-256 39eef078384cba5f…

MALICIOUS

PDF

75.7 KB Created: 2021-04-28 23:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f6fab36b0d1329b5ef8213da06df392 SHA-1: 9586d1b05a32370a9a1cd6a076b9ca6ddfd78ad7 SHA-256: 39eef078384cba5f1641f6b77aac0df7d10c548e2023066c401338c17b80fcf5
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=4+types+of+secondary+manufacturing+processes PDF link annotation
    • https://tusozokusex.weebly.com/uploads/1/3/4/6/134678333/romisofipu.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/how_do_i_find_the_area_of_compound_shapes.pdfIn PDF document text
    • https://kujofajatoniw.weebly.com/uploads/1/3/1/4/131406813/petetulumumoti.pdfIn PDF document text
    • http://zujewap.mygamesonline.org/kekokozipimukexetijuzuj.pdfIn PDF document text
    • http://woronari.getenjoyment.net/83756104162.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/zakezasiregevuk816q.pdfIn PDF document text
    • http://lumejaramelu.mygamesonline.org/gexesisiwekabuniwe.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/punjabi_alphabet_tracing_worksheets.pdfIn PDF document text
    • http://bagawixaj.mywebcommunity.org/19060221743.pdfIn PDF document text
    • http://storeyou.store/broadcastify_police_scanner_apkkvbkk.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/6896831.pdfIn PDF document text
    • https://tinozuxitijerel.weebly.com/uploads/1/3/4/5/134528375/zadebubizow-muvoxijisame-vibidu-negax.pdfIn PDF document text
    • https://sutovuwoti.weebly.com/uploads/1/3/0/9/130968995/7867658.pdfIn PDF document text
    • http://fapseo.ru/free_instagram_followers_and_likes9a9qd.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/nuleguxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_83b9b40f44b349739b921648512a2224.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_08e8edfdd1b04286af384b41c705014b.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_767bcfabb18540c1a2abd72889316492.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_3dfa29fe827642f8960dbe2b47b2b568.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_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 5540 bytes
SHA-256: 02eb217069063a588f955aa8f1c6a2ee65af884953876ddb7bc9b6169ec727a8
font_01_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 11148 bytes
SHA-256: 1746ee3bce96db48a43422bed502913f25583988a74d88b309966b743232e262

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