Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa3f1f5422fb9fd…

MALICIOUS

PDF

85.2 KB Created: 2021-03-15 21:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e50eebdfdfd6463b7e9a3a7a605d5012 SHA-1: 73233b8652070224d04e92e773947ff98c7cc52b SHA-256: 3fa3f1f5422fb9fddffae593853ba34d79f85a9b60b58d2ffb1385711b825f52
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which are to benign-looking PDFs, but one prominent URL, 'https://kuzutuzo.ru/strik?utm_term=what+exercises+build+core+strength', is marked as unknown and is likely part of the malicious infrastructure. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond linking to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=what+exercises+build+core+strength
    • http://watertea.space/the_giver_personalityjchp4.pdf
    • http://fastcreditreport.info/isopropyl_alcohol_sds_sheetsxoh6a.pdf
    • http://craftsmansmetics.com/who_has_many_wives_in_the_bibleiqd1i.pdf
    • http://begemot.space/buxokapadefelobujulatinupy5tut.pdf
    • http://ru-en.xyz/mokabunifesen2mkow.pdf
    • http://edayafar.xyz/vipamotj7tr.pdf
    • http://hayatevesigar.online/wedetq5xt4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/268cb22e-2154-437f-819f-bd0f3ab3408b/how_to_view_your_house_on_google_maps.pdf
    • https://s3.amazonaws.com/luramamelolem/access_consciousness_knyv.pdf
    • https://s3.amazonaws.com/wutisigila/new_testament_bible_stories_in_order.pdf
    • https://uploads.strikinglycdn.com/files/ee030a6e-cc03-45cf-8f68-a3bed8fc1a32/arifureta_light_novel.pdf
    • https://s3.amazonaws.com/jivuxo/88712232751.pdf
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_5b08c925ae024b34a2a174c8cfdf8bec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3993939d-14ff-4dea-800d-a49388d35c5c/digital_marketing_public_relations_examples.pdf
    • https://uploads.strikinglycdn.com/files/9fc264e5-14ca-4758-ba72-433639cec2c5/imperfect_vs_preterite_tense_spanish_quiz.pdf
    • https://s3.amazonaws.com/pazovugal/kenexa_prove_it_excel_2016_test_answers.pdf
    • https://s3.amazonaws.com/punurum/vicks_humidifier_pads_walgreens.pdf
    • https://s3.amazonaws.com/vojapu/ak_case_hardened_pattern_guide.pdf
    • https://s3.amazonaws.com/tomamujuf/jomitudakekefugiwerow.pdf
    • https://uploads.strikinglycdn.com/files/4c22ce45-54ea-4b4e-85c0-1ca06ad68d66/what_happened_to_yahoo_stock_symbol.pdf
    • https://s3.amazonaws.com/wexukufedepim/arthritis_uk_neck_pain.pdf
    • https://s3.amazonaws.com/godoremitiwuja/ximilifo.pdf
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_8df817e9d6344dc1a14a6b77d11cd1fb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e9f.bin
89efe74cb34c7546704eafa29728737772535a1a973d615c7d032372f2bac1dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 5424 bytes
font_01_sfnt_off00012118.bin
0bfbc01bbb2c05cf606680d2531ecee3d5f63378b03f1ea23ffb2285068d47a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 11152 bytes

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