Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5277f6724a52df…

MALICIOUS

PDF

68.3 KB Created: 2021-04-01 04:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc2708e1a0a9c4082df4e141d916f0e8 SHA-1: dbb2ef7d2b3542601ce449becb0308236f0f8e7e SHA-256: fb5277f6724a52dfad3a207d3b8538e9d096fec64a04fead7cfa1604317ac7e6
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector and another part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of these links suggests an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wix?keyword=bill+nye+the+science+guy+mixtures+and+solutions+worksheet
    • http://sunugukumota.getenjoyment.net/wizumunizabakerafexar.pdf
    • http://opensol.xyz/how_to_reset_a_sunbeam_heating_pad04zj5.pdf
    • http://tramlaweq.online/stunt_bike_race_new_free_games_2020_videoee304.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jazuravazaguz/xamarodujaserene.pdf
    • https://uploads.strikinglycdn.com/files/07812d7d-5851-4960-96de-0fa64c18e831/why_is_my_macbook_not_charging_no_green_light.pdf
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_412be6b79ffd4432b3dfd121302c9f8b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9c6b03d3-51fb-4265-91b2-af0d406f2c5d/povavaxol.pdf
    • https://s3.amazonaws.com/fizup/sevofidalafedolajuneke.pdf
    • https://s3.amazonaws.com/ladojenefe/hagamos_un_trato_mario_benedetti.pdf
    • http://sogurorirerew.onlinewebshop.net/rakavopubusub.pdf
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_f362276c9cad422583577137fbd40c26.pdf?index=true
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_5d77eff5d40b4f748cacff674480fbde.pdf?index=true
    • https://s3.amazonaws.com/gekojulog/virender_sehwag_cricket_batting_tips_video.pdf
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_6cccee49963c4b4c93ef0583d4f2bd81.pdf?index=true
    • http://kufekisawisewo.onlinewebshop.net/hydroxyapatite_synthesis_properties_and_applications.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_off0000cdbc.bin
c1f5d2516fea713f1e054b354e3a77c7daf0f3ead6a54a02415f3e53d3d525d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 5728 bytes
font_01_sfnt_off0000e12e.bin
afdc65710dcde7c3818cedea587e93c13fafe7cd8d035ef6ad7e22bf59cff726		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 10012 bytes

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