Malicious PDF — malware analysis report

Static analysis result for SHA-256 438cdf8dd954d617…

MALICIOUS

PDF

76.1 KB Created: 2021-03-19 12:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e506628b43fc12e6eaa27df94c33e0f SHA-1: 69426929dbfb327e9aba809ab9adfb1a26b7f5bb SHA-256: 438cdf8dd954d6170f254eddcb595cd066f8f0c392e7a976a40533757b34af74
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to a link farm designed to manipulate search engine results, a common tactic for phishing and malware distribution. The presence of a URL with UTM parameters suggests a phishing lure related to an 'aadhar dob update form'. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/123?utm_term=aadhar+dob+update+form PDF link annotation
    • http://fumufede.iblogger.org/55545784744.pdfIn PDF document text
    • http://belixawotid.66ghz.com/vuwexuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_05ed6d56d078422ea351dde47daf5c02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/ielts_2_listening_test_1_answers.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_e062627745844dde9a428fd581573749.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8e18f4-bb45-48f9-84c5-6ae126b97a01/54972606552.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/collage_picture_app.pdfIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_1ed9a7d7213b43879bce2fff214f1a21.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_305c834d5b3c4148a148bc290e0a1064.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetevali/25262404093.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/16953826845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ec4520-1ec0-455a-9cdd-8cbcfe507205/ford_mustang_gt350_for_sale_az.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_136ff629e9524d5d96ea3b56c81b0ce5.pdf?index=trueIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_fbe8af26a7e744e6bd577f4767e79022.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_08ac4697dcbf48709d315ae84cd9ab1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bc4f7e-9a98-4b9c-ab4c-cd1ad958f013/smokey_mountain_smoker_assembly.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_a2c62690ed0a4fe088a6081225dab996.pdf?index=trueIn PDF document text
    • http://zidazimimaf.epizy.com/30179724001.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_011e60cc314e4f55b0932ca5000ba668.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/litug.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_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 5200 bytes
SHA-256: 718cc9b530986dfbf48231bfc767a802f748e8bcafb3ef40e702e3ebca03d5ae
font_01_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 10704 bytes
SHA-256: 3fb19ea0bb6a1481169f35bab7c5f67e0931b1ba92757f3d3137f49b93dc436f