Malicious PDF — malware analysis report

Static analysis result for SHA-256 7019b77b58dcfe51…

MALICIOUS

PDF

81.1 KB Created: 2021-03-27 17:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4b765031afed22b89f6aedd12be9ff92 SHA-1: 032e476e706408ee62238ceb5db0f3d450b8b40f SHA-256: 7019b77b58dcfe5191b7d17a1731e56ace92c46c49c952adf78feaa9fa6a1191
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the presence of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=electronic+workbench+tutorial+pdf PDF link annotation
    • http://bidizujimon.getenjoyment.net/98329025326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369657/normal_5fc7dfb435ed5.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/72411019201.pdfIn PDF document text
    • https://wetegawufuju.weebly.com/uploads/1/3/5/3/135302163/gevaxixipoxida.pdfIn PDF document text
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/rarizadobekoji-bexudona-manebikamixan-dewojodikid.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/9838605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_601561e61cfa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407991/normal_600fd1da2587e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_6055793634330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469365/normal_60382b18d3a97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_73a14a71c9dd45a4a0c6e727d1cb499d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcc082e-0516-43bc-915b-78b9d0fb0ce2/how_much_does_a_lifeguard_make_at_the_ymca.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_31403f8aa9d4481fbd2d78e9f2d47995.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf468e9-fb07-4194-a715-9d0396e7d369/takikaworarasikezul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2092ca02-cd78-4c30-aa42-76166f0d73d2/jegomufezatapidu.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_d226f79b12a14b4ea71eef8b9f264a86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45ce8aa-4343-48c5-94b0-fd64aac78054/24551928042.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_288ec1095df14cbebca2d17f074bccc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdb6068-d004-4193-b50f-57afcfcb4b80/ncert_grade_10_english_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a41e53c-8629-4a1c-9f27-106f3852429d/rivisemipo.pdfIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_e1ca01ce29dd436a8071012d794c1368.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 5316 bytes
SHA-256: d0151f18c32a71c6802212595c1d32dd9e86749ac98b2a2de95397d014fedf36
font_01_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 10416 bytes
SHA-256: 87699ca2d795c09b4d1953ac3ba253dac82f9bd36ba644648f8292fbeb81362b
font_02_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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