Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9421e3b15b1c61…

MALICIOUS

PDF

80.5 KB Created: 2021-04-01 14:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1cb96754b70dc3dc2ad1bf148931e282 SHA-1: b1d6843455e96a5d60e7a436d40204bcba6c6b29 SHA-256: 5c9421e3b15b1c61c8d56c76d4f2de43adfecc5dc78f0b7823ff624cca09c03e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically using SEO link farm techniques to distribute links to other PDFs. The primary malicious URL identified is jumiwimov.ru, which is used in conjunction with keywords suggesting a manual download. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malicious content distribution scheme.

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.
  • 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://jumiwimov.ru/wix?keyword=gopro+hero+4+manual+english PDF link annotation
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/wegoga.pdfIn PDF document text
    • http://kepibarufot.22web.org/borefadug.pdfIn PDF document text
    • https://purapunebofo.weebly.com/uploads/1/3/4/8/134888030/7043476.pdfIn PDF document text
    • https://vopumatibu.weebly.com/uploads/1/3/4/4/134402560/0b0a24c1a960f6.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/23e6a6f5e7e.pdfIn PDF document text
    • http://gesajobode.22web.org/marley_cooling_tower_catalogue.pdfIn PDF document text
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/repimifemuxi_nanoke_bofapujapumi_tuzepepuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/resisuna/62665531177.pdfIn PDF document text
    • http://mibobugaf.rf.gd/functional_testing_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0753f666-66ec-4dca-9b02-d1e7b0ee232c/cuisinart_coffee_grinder_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/vatabuzetiwaxurewadanekav.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/12964503439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8538b32f-452a-4898-9536-b2dbf54d572a/remember_your_roots.pdfIn PDF document text
    • http://jovavajes.epizy.com/mazepawisatunepowebej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58550a1c-2dd2-4b2c-b91c-30f619d46e13/how_to_install_keurig_side_reservoir_water_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/elon_musk_ashlee_vance_page_109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096043aa-c069-43bf-a28e-553c33e5cf6b/rawofiziwizixegaxet.pdfIn PDF document text
    • http://zimufoduso.rf.gd/45774494265.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/disuxulegitusul.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/lazuxomixa.pdfIn PDF document text
    • http://mawarine.epizy.com/ac_odyssey_cultist_guide.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_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 5352 bytes
SHA-256: 1bdca155bbb91b8cfeca0e0011a6c25091720836624c5da29823302a6345c044
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 11044 bytes
SHA-256: b002bd1d4c2e6ca304b8d5029f33d703363ebb16d28e5674baf24dc94401e123

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