Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03237621174c6c9…

MALICIOUS

PDF

74.8 KB Created: 2021-03-31 17:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a37bb769f9b5956ab0bf7c125aadf758 SHA-1: a996983f7325feac462f04ea9e1ec55967e8d0cb SHA-256: f03237621174c6c907163dbd05aea0e54aa3da2aef9c38ff39c3d917cd50876b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to phishing or SEO spam.

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://botokaw.ru/123?utm_term=computer+case+screws+guide PDF link annotation
    • https://kixofugowewo.weebly.com/uploads/1/3/1/8/131872146/taboziregusi.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/lekagolerave.pdfIn PDF document text
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/vuxotufuvi.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/7727398.pdfIn PDF document text
    • http://snail-case.store/who_made_tappan_furnaceszxybn.pdfIn PDF document text
    • https://duzonaxur.weebly.com/uploads/1/3/4/0/134012347/taved.pdfIn PDF document text
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/zatazimigewuru.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/megila-senizevogovofim.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/lokukigexufaj.pdfIn PDF document text
    • http://smartline58.ru/letegugekedufulamuxu8n6j1.pdfIn PDF document text
    • https://temegefa.weebly.com/uploads/1/3/4/5/134583031/5393244.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruriwujuvuwa.epizy.com/25234864969.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_868bbab2676d4e91bb42bc74588dd3e2.pdf?index=trueIn PDF document text
    • http://gamojowogezozaj.epizy.com/best_ebook_reader_for_textbooks.pdfIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_f94a07d61f37463cacd96e1fa00b279d.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_8916ff6eb51747c58373df8c0bc9483e.pdf?index=trueIn PDF document text
    • http://sajonagot.rf.gd/casualty_loss_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/750b8a6c-43dd-45a2-98f8-e9e398515db3/beats_studio_2_owners_manual.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_0b441893ea1249d18e918fc1a83f6f7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a2fcdc-b9bd-4ac1-b935-a2af2a586e90/how_to_use_my_cloud_home.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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 5360 bytes
SHA-256: 4c55f7641a86c43dbe9861608f2884206e06342fcecaa36e3214e27e4ddaa7e4
font_01_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 10808 bytes
SHA-256: a4b651a7c96942f771a9f2253dd17da5b1cfe228dd3b3ca32292367103de65e2