Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99c1d0900e9e278…

MALICIOUS

PDF

81.7 KB Created: 2021-03-22 16:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f98cb1f0581bf265b573b63d17fbf327 SHA-1: 6250e78d89ff3e267aeebaf0eee51c9421fc0972 SHA-256: b99c1d0900e9e2786be75459e7fd0eb24dfbc2f0d06e55a1c76ba0969b283c3d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic point towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=veiled+sentiments+lila+abu+lughod+pdf PDF link annotation
    • http://nevinidonet.mywebcommunity.org/call_me_by_your_name_book_vs_movie_reddit.pdfIn PDF document text
    • https://jisetufazuv.weebly.com/uploads/1/3/5/3/135307323/352135.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/a_discovery_of_witches_season_2_episode_release_dates.pdfIn PDF document text
    • http://rotugozebowovu.iblogger.org/what_is_the_meaning_of_social_impact_assessment.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/31654516476.pdfIn PDF document text
    • https://gisixumaxen.weebly.com/uploads/1/3/1/8/131856636/38efa5215e91cca.pdfIn PDF document text
    • http://perinolaguzur.iblogger.org/69394569307.pdfIn PDF document text
    • https://zutepojajobemo.weebly.com/uploads/1/3/1/4/131454264/wurijimezoxazize.pdfIn PDF document text
    • https://fedobakeruja.weebly.com/uploads/1/3/4/3/134367732/lujeginokudimen.pdfIn PDF document text
    • https://mobiduretul.weebly.com/uploads/1/3/4/6/134681609/61d37d3a.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/bf68b82a-29ca-4f04-a8b7-9a0a3a120633/zuvutupelefimevajatavikun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c54f561-e32f-4992-8907-5b8551f4da4f/dr_seuss_book_characters_list.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_bd1b45d8e908428f9a3cc9428feb8ab3.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_b8049ffdc9414f43818109f3b5370664.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f71d403-a8a2-4f6f-b06a-60c99427b5ea/polk_audio_dsb1_soundbar_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855396e9-2a27-4d90-9437-2d92bde280b8/visenenorilodiluxomoreza.pdfIn PDF document text
    • http://wekujugom.epizy.com/blighty_dab_radio_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3312cb-b854-4a66-8f16-c3c671186423/mujebu.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_b9f117b5389a44ca88d52a29401299c6.pdf?index=trueIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_3f9b9cf739214f40bbdb98270c30038e.pdf?index=trueIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_3fc74f48b0e54303a1de490788ad7153.pdf?index=trueIn PDF document text
    • http://rilimopukalus.rf.gd/53509422421.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_47d69fbb05e445bdaec338488752eb11.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_54b64fb3bbd34c76b7f7025c460bcf02.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_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 5464 bytes
SHA-256: e35f931d2c6d4b4db384f6ac7fcdd844f51181615e21cc5a245039d2a3e16c08
font_01_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 11616 bytes
SHA-256: 66663597cd0bcb07565bbb696337a288480ee039df0566c452c3dd33ffab1f83