Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc97a635b2aa7d28…

MALICIOUS

PDF

74.9 KB Created: 2021-05-07 04:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0a858e2a611529b89acb7d20242f3ebb SHA-1: 216c10a7261a6e2c8c402d01a8fc48cb50d582f7 SHA-256: dc97a635b2aa7d28a2b91e8fe2c3a32f3a2c15644100703e2ffacd2dc8e03cd1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to mathematics, likely to trick users into clicking the embedded links.

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://gimoguvi.ru/strik?utm_term=que+es+bosquejar+en+matem%25C3%25A1ticas PDF link annotation
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/1e214.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/cc1398ebd0.pdfIn PDF document text
    • https://wevikafajaxa.weebly.com/uploads/1/3/1/1/131164556/868470c8ce1b7.pdfIn PDF document text
    • https://biwusegunaji.weebly.com/uploads/1/3/4/0/134096831/102190.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/duzidokasejivifa.pdfIn PDF document text
    • http://creditscorerepair.info/994405783490gd74.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/1df4274609f.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/133832473504ep7o.pdfIn PDF document text
    • http://defesam.22web.org/9248103942.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/why_are_kodak_batteries_so_cheap.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/group_counselling_techniques.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_db53f1261c834d6f908603c2f0635c8c.pdf?index=trueIn PDF document text
    • http://gozipoxux.rf.gd/adobe_indesign_cs6_classroom_in_a_book.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/24996103437.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_79b8a45a6e654bb8bfaa9efcd7abb5e5.pdf?index=trueIn PDF document text
    • https://034b020c-baab-45d1-b3ff-c950d21f9178.filesusr.com/ugd/3c93bc_3b5c26e0b73042849bd2b5a75b4266ae.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_232aa6b76cb24ed7882879d5b68cd2c6.pdf?index=trueIn PDF document text
    • http://liroporuki.myartsonline.com/star_trek_into_darkness_cast_carol_marcus.pdfIn PDF document text
    • http://bivofigelekira.epizy.com/artificial_neural_network_free_download.pdfIn 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_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 5548 bytes
SHA-256: 730aea93fdfcf0624eb84460d0d1c35133194d2ca797511784d7fb6855113cc2
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 12128 bytes
SHA-256: f897704050ad80b90e23e2760c8a8f778c939b61c553b07771881ebc9ed9410d

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