Malicious PDF — malware analysis report

Static analysis result for SHA-256 77efcefec0d6cf1c…

MALICIOUS

PDF

78.8 KB Created: 2021-03-22 22:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 190488494b5e81fcd78782e90c123386 SHA-1: 6b70e4ac58e0e575387c2df6028ce1520dbd83c3 SHA-256: 77efcefec0d6cf1cbd2de3c5daa2e0ebcb3ac46515b635e66d5c58134eba04ba
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a fake invoice lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jumiwimov.ru/123?utm_term=lease+agreement+in+tamil+word+format PDF link annotation
    • http://bio-ita.fun/93714429354giti7.pdfIn PDF document text
    • https://falitevegenos.weebly.com/uploads/1/3/4/3/134321562/wukevasoxobavogaxina.pdfIn PDF document text
    • https://xadadoroz.weebly.com/uploads/1/3/6/0/136024884/vusatafodameroga.pdfIn PDF document text
    • https://tugufotekaluxaz.weebly.com/uploads/1/3/4/8/134883762/ad58ff7bc40cc.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/2609798.pdfIn PDF document text
    • http://cuzinfo.ru/95567399079by8yi.pdfIn PDF document text
    • http://mekozeka.66ghz.com/vetuxenegewagitobixido.pdfIn PDF document text
    • https://feverawujebuv.weebly.com/uploads/1/3/5/3/135314909/7283115.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/georg_lukacs_theory_of_the_noveld9hzc.pdfIn PDF document text
    • http://agent-spv.space/93224809580e6r02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_3b78c8eef3ec46b59b81da93ddb903cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/824bcba5-0cb5-4abd-bbf5-a316369b9477/guximojivewodazuxoda.pdfIn PDF document text
    • http://jokunikef.epizy.com/65646112692.pdfIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_7042bb37bb72488c85753662746443d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b848c31b-2746-472a-82fb-8198bfd34e33/mifuxuw.pdfIn PDF document text
    • http://velefupidunipa.epizy.com/97590577879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f744da-4fea-4196-879b-73e561de8b17/how_to_convert_rectangular_to_polar_on_ti_84.pdfIn PDF document text
    • http://muwalolerede.epizy.com/xodibubepizepibex.pdfIn PDF document text
    • http://kupikobu.epizy.com/free_animated_puzzle_powerpoint_templates.pdfIn PDF document text
    • http://dekuxibasor.rf.gd/hollywood_movie_app_for_pc.pdfIn PDF document text
    • http://wojudor.epizy.com/lolasubelewoput.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_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 5260 bytes
SHA-256: 3524ea66f88807a9e674ce6a2acaf1dead8f70a3d7532fd138ab4734d5c83939
font_01_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 10540 bytes
SHA-256: da8f5a06c375f58656c0fd9cbdd47a4418e84218c91f097bb4f9e7bae28a452c

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