Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d133e5507f470b…

MALICIOUS

PDF

117.5 KB Created: 2021-03-11 16:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 697e54eb810d3624fd3a7e3f1de18396 SHA-1: 24d4354c7ddc1ef05f4f9e9935f517a8afbbe01b SHA-256: 13d133e5507f470b0da10c29a289c0ac781d6643de34241cb8ee7c53e50cb0bd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One notable URL is http://carbags.site/9107391895ltaw5.pdf, which is part of this farm. The document body is heavily obfuscated, but the presence of external links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/123?utm_term=anaplastic+astrocytoma+and+glioblastoma+multiforme PDF link annotation
    • http://carbags.site/9107391895ltaw5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_6015840311bb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_604010fb0d744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_602092f808c78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_602fe6a88f221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_600a6af143d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_600bd2e2d631e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_603c7e3ce8511.pdfIn PDF document text
    • http://mishabelle.ru/how_much_is_back_surgery_for_a_dachshund_uk9tfly.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/sinajosotiv-jozixutosux-difarike.pdfIn PDF document text
    • http://circus.market/microsoft_xna_framework_redistributable_4.08vdgs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_6048a2218897c.pdfIn PDF document text
    • https://dojovirofolabi.weebly.com/uploads/1/3/1/0/131069789/kudanotogus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fe5146c36044.pdfIn PDF document text
    • https://zufesuvagudinaf.weebly.com/uploads/1/3/4/3/134321689/4716372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_5fe63d9bd5179.pdfIn PDF document text
    • http://handler-autoscout24.com/ziludujulirakufibobolupszrov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac3af92-7635-4abc-98f0-02e08833c7ab/how_to_be_himiko_toga.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_e20c44cd3aa049b2900cef085066840e.pdf?index=trueIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_a69a7c2e4e214c4180d8183960b6e0f8.pdf?index=trueIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_02f5a5a638994981b4cf60b273e8ab58.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_10cf1733fb8c4e8abedd375f2d1377d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef8489c-e472-468c-895f-f04e305d9645/can_you_keep_a_secret_film_age_rating.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
    • 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_off00017732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17732 5708 bytes
SHA-256: 3427e3bc8166762d43c5d0b628694b01b2973f05e14db660fabc0cde0aa02978
font_01_sfnt_off00018a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A8E 12172 bytes
SHA-256: 2d44239c22019b7b4c0e0e1523ba0164fd3bed655f2a0ab3b73e77d9af302a44
font_02_sfnt_off0001b2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2F4 16076 bytes
SHA-256: c4b3bc0809dadb5b5a06ed5c5570b540227ffabe6ac7105d410b3617c465a8d0

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