Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ead4aa6b7b3d4f…

MALICIOUS

PDF

81.7 KB Created: 2021-03-17 22:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a8e49d90580a30dec4b89b16c287665b SHA-1: 083e3be6646673d81294822a38265f86efa96486 SHA-256: 52ead4aa6b7b3d4f8ac28413df98eafbc246b0120dc2c92f653d3340ada09245
244 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with critical firings pointing to known malicious redirectors and disposable hosting. The document body, though heavily obfuscated, contains text that appears to be a lure, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=those+who+waited+on+god+in+the+bible In PDF document text
    • http://gazagidumow.mygamesonline.org/88786777617.pdfIn PDF document text
    • https://dimulawi.weebly.com/uploads/1/3/4/3/134380670/tozofosisujiwuxeluna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_602f99ecf1663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_60493f57c7cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_5fd32add7b738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_602d68e126cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_6025cc685c356.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/what_is_the_theme_of_the_book_the_curious_incident_of_the_dog_in_the_nighttime.pdfIn PDF document text
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/debowivagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_600d5ed3a1b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5fd11c55a95ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_603f46131297d.pdfIn PDF document text
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/4752881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/philosophy_of_community_health_nursing_in_hindi.pdfIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_26d35a89c4ed40d7b2d016159f042fb3.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_61e54920c9244a74afdb98a52ee40e9d.pdf?index=trueIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_2f65842a6a814b9a80fce7ffb23b5f83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/losinisuboxatejob.pdfIn PDF document text
    • http://semowomeso.onlinewebshop.net/mensagens_do_arcanjo_metatron.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/badumur.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_da7bba0ead6645908213d4095d1b1bdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tofizo/78421747898.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_4ad6565035ac4ebbb675937f0b4552b2.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_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 5172 bytes
SHA-256: 21e138d89bc8a9f0d6afe4dec2473943bb7e07305a7d4494d300d64611314915
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 10564 bytes
SHA-256: 4e72b6b6fcbe21723604aac862d5529b6b4fc6ee42ec325420796e446cda1bde