Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda34fddd8089cc8…

MALICIOUS

PDF

81.9 KB Created: 2021-04-08 04:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: eef68763e465599d72a04868ae10c206 SHA-1: ed7f71a0d17f2d7b459079512fba291733806f0c SHA-256: fda34fddd8089cc83c10ad920d533b93d2cf7aee5f6861f5ba2fec4ef1827520
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, with many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature. The document body is heavily obfuscated and unreadable, but the heuristics clearly indicate the primary function is to redirect users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/wix?keyword=vivid+seats+fees+reddit PDF link annotation
    • http://kefijor.mygamesonline.org/athlean_x_max_size_reddit.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/koxikufajekegukobarupiv.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/international_sales_manager_jobs_in_india.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/28530843925.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/4d380680-cbec-4101-91de-14536649b100/blankets_craig_thompson.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_2f3f631080f74cc4a07e333564bb390c.pdf?index=trueIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_7bd7f7ab62e449ad8264cf7fe8211cb9.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_ee53bc0c7fed4b7686cb3ab0e20326f2.pdf?index=trueIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_2774cd8b1fd44f2dbaf7368dff150159.pdf?index=trueIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_7599f6a6ee264060b3a7b810e637142e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/849cfa2f-70dc-4da2-a8d0-4fe2dd4d0c73/piguj.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/27824398368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f14511-1829-41d9-8065-a6252a6d0f06/how_did_most_billionaires_get_rich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e0daaa-50cc-4114-bd61-130ac84dec33/95705728862.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/kuvanuwas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e6650e-638c-4fa5-b742-107e03889052/how_to_bypass_the_timer_on_my_turkey_fryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e075ccb-22f8-442b-b31b-a26685b6a772/data_warehousing_definition_francais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac823c75-97f4-42f9-adae-39e676f796ad/why_wont_my_volume_work_on_my_xfinity_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e349c2-eb9c-4a92-bdf9-cbb216e26b30/the_new_one_minute_manager_book_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4f7fdd-de56-42f0-98fd-c3a0ceadd716/duwajapujuw.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_3161f83270704c28a0865af73c0a7822.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_ae7fae844fe74e9f969c83279e209319.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 4896 bytes
SHA-256: 39582dab4695fa375f798d5769385ff4fa4e03e20e874b68c16c70d22fe892f6
font_01_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 11192 bytes
SHA-256: 1f9df78881549ec931f1b50894701a2d965fe3f95596b54c6b10fc545ffc7996

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