Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ee5556ee26f764…

MALICIOUS

PDF

80.8 KB Created: 2021-04-04 20:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e9da2c40ab0266741c9cbcabc4b3ea91 SHA-1: c980f9c68805c762f785637167350fa727ed2f6b SHA-256: 43ee5556ee26f764b8489d601a691618c9f88a6cbafd29847968fe1447ac7919
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the sheer volume of outbound links points to a coordinated effort to direct users to potentially harmful content.

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://leonvi.ru/award?keyword=amending+the+constitution+worksheet+pdf PDF link annotation
    • http://bepelisufozasep.mywebcommunity.org/airframe_and_powerplant_technician.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/7386f4f06df48e4.pdfIn PDF document text
    • http://ig-soft-team.com/bubomigunurokomesufelavuklpbid.pdfIn PDF document text
    • https://cdn.sqhk.co/vusopukov/fofuicm/gofiwuvimuna.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/8784083.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/jfjiBG8/95695139387.pdfIn PDF document text
    • http://doordash.link/apache_poi_convert_to_excelk3dxq.pdfIn PDF document text
    • https://cdn.sqhk.co/bivosemubo/4xqiiij/performing_arts_management_masters_degree.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/dJfm3gc/punch_boxing_3d_game_video.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/wofadegixekusixpli4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_6031dc51d3a6f.pdfIn PDF document text
    • https://jutikuned.weebly.com/uploads/1/3/5/9/135966087/webodezonanebiro.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/hhkiaif/the_green_alien_dance_full_song.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/how_to_use_scarce_resources.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/9895758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497081/normal_5fdffab24e240.pdfIn PDF document text
    • https://nipujari.weebly.com/uploads/1/3/1/3/131384055/225125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zagupijalixi.myartsonline.com/tappan_range_drip_pans.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_6d8c2c5b2f524f4f9f9d892629b9453b.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_fb97f204f8b04d23a4e16c559ddb82ab.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_5ad4d7f4e7fa48b392c68bf74a43846f.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_ebfb242ffa284539b5085d562f47a1b4.pdf?index=trueIn PDF document text
    • https://31f314b5-0768-4c24-bd49-4596ea953b46.filesusr.com/ugd/85a4b1_939681afc34a44a7a9dddbc2bf4a7203.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 5356 bytes
SHA-256: 7d1852e15dda48d86bdd239fcb843dd17b9a3b09ec87af81b6c8c27ac9a9f710
font_01_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 10996 bytes
SHA-256: 8377dd9ffe2b47efb2a92442ee1f13bc40ee14b28de9476293d4b5094e8fed54
font_02_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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