Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c11eb9dc8f80a2…

MALICIOUS

PDF

66.9 KB Created: 2021-03-27 10:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 24459c511c1a03348e434829b42b37f4 SHA-1: b0417eb35ffbc93145866f2c624cafb91c4d5aca SHA-256: c4c11eb9dc8f80a20b201aee18abb69bf6c0276692ddeec1eebeae3255336e48
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 0.9997

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://xezojetit.ru/award?keyword=struts+2+framework+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/venifirub/apGNjfX/33536313083.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/forezojikuxefipasejaz.pdfIn PDF document text
    • https://lugewulisafope.weebly.com/uploads/1/3/4/3/134311751/9832423.pdfIn PDF document text
    • https://cdn.sqhk.co/vamapoludi/chh6qNi/barbecue_chicken_pizza_jets.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/xananak.pdfIn PDF document text
    • http://dabinepoj.mygamesonline.org/16653042307.pdfIn PDF document text
    • https://tebumozokafu.weebly.com/uploads/1/3/4/4/134471783/sapakezowe-wetegeroletupik.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/5777191.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/scotts_speedy_green_3000_settings_for_weed_and_feed.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/hiYlhiD/tepokorudopavesamirudak.pdfIn PDF document text
    • https://xevupuwikuguv.weebly.com/uploads/1/3/0/8/130814145/ac2b6801efd9ee3.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/iakv4q6/idrivesafely_unit_8_answers.pdfIn PDF document text
    • https://xazonulukobimov.weebly.com/uploads/1/3/2/7/132712199/gesudujemad-kudubo-poxepomotuwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_5433beaa117b4950b329e9c6cae123a1.pdf?index=trueIn PDF document text
    • http://wofavum.myartsonline.com/96667983523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00fc043-1498-43cf-a1cd-a938cb07d199/buzukekipaxamo.pdfIn PDF document text
    • http://pigutun.myartsonline.com/bella_single_serve_coffee_maker_parts.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_0ba4b52d18e542cabdac32da09661b5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/758649af-c293-441d-85f9-b9e85d41ff87/92071976261.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_30cb44ecc7b048e5852c15093875b723.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_b99761167ac54ba191a0bd37f538de7e.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_off0000c1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D4 5576 bytes
SHA-256: 45ab9b7162cfa69bc5842158dbea4c2a406265a730971d333fd6c9822ebbb6ca
font_01_sfnt_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 15776 bytes
SHA-256: 9c2291ab7bae416d22566f2b8ca97c33d8ee6fa2542986b4a871dcc6502afd58