Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7695aef86e9f9a…

MALICIOUS

PDF

107.1 KB Created: 2021-03-21 22:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1226e5301c1d52cbfe9a85f4f7a120d SHA-1: 70f9104dd4a7fb5c7954a53843790b890dffcfa1 SHA-256: cb7695aef86e9f9a286d3f575378e220f88a62fdc74f51f1a27fbde877baabd5
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The embedded URLs suggest an attempt to redirect the user to potentially harmful content or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/aws?utm_term=what+are+the+benefits+of+trade+shows
    • https://zegikawa.weebly.com/uploads/1/3/4/6/134640481/7626590.pdf
    • http://mavafesumej.medianewsonline.com/fernando_pessoa_poems.pdf
    • https://cdn-cms.f-static.net/uploads/4416125/normal_5fd392d1d20ce.pdf
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5fcfa440b3975.pdf
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5fd0a0373722b.pdf
    • https://gefetejumifigo.weebly.com/uploads/1/3/4/6/134688955/daluwidepikenub_ripagujip_figatak.pdf
    • https://cdn.sqhk.co/popaxutu/hjhhhhm/ticket_to_ride_song_original.pdf
    • https://static.s123-cdn-static.com/uploads/4488139/normal_5fcfec357ad2b.pdf
    • https://fivubiforozoxi.weebly.com/uploads/1/3/4/6/134676017/gadalirizowexa.pdf
    • https://cdn.sqhk.co/duzemata/WJtifZU/getidikadufe.pdf
    • https://cdn.sqhk.co/tesigasefaxe/d5idUPb/last_shelter_survival_base_layout_level_5.pdf
    • https://cdn.sqhk.co/marezotije/hfA7GRU/nabanakip.pdf
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/48c5ff3c39.pdf
    • https://baxikulalul.weebly.com/uploads/1/3/4/5/134582220/3ccdce73a.pdf
    • http://zakosemej.mypressonline.com/davigij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_95907653d14941faac3b46565524dd74.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d33d711f-47cc-41c7-985c-0486eb00bd68/how_did_the_smilodon_defend_itself.pdf
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_09b9cbc30eaf4ffeb5c31a7c0d6b1f01.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f771f48d-1ca2-40b7-a87e-003c00d5715d/10870031099.pdf
    • https://uploads.strikinglycdn.com/files/0f14a09b-8f40-4515-9f67-c3d2ba530c07/bonodikifaju.pdf
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_ddb2cfd528b64aa4b1797ed07db5f0e8.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_b91d5116ada8431b9dca19c5b8677194.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e165966-1d8e-43dc-be14-c302269a1b04/who_makes_double_drawer_dishwashers.pdf
    • http://gogujigasad.onlinewebshop.net/taluxepatajunev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001665a.bin
ce5d7e8802a19426d0e0ac82f51e82da320a6dba03c00487a3d69dca9cd0a0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1665A 5208 bytes
font_01_sfnt_off00017820.bin
4cd4569bf53708448a7e2faf37e8eef16e5e80d13cdce5fda16d25e0866a9783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17820 11328 bytes

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