Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf762ac017aa0e2b…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 18:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26651408457f7d01c1337f3424bcf693 SHA-1: 6955e0cb8a428d9216f66750d84128ddf3571339 SHA-256: cf762ac017aa0e2b3d7f5f9a2c5310fef38cb8f2171f94eb3a26ea271a27c0a7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://xajibur.ru/strik?utm_term=how+much+does+a+70+inch+samsung+tv+weigh', suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=how+much+does+a+70+inch+samsung+tv+weigh
    • https://cdn.sqhk.co/fidegelotag/c4WXiiR/the_good_bad_ugly_ringtone_for_iphone.pdf
    • http://kikudesazogug.22web.org/oxford_discover_6_free.pdf
    • http://selozufuwadapuw.66ghz.com/nigiketikixogi.pdf
    • http://zowomojagobipur.iblogger.org/blue_cross_of_illinois_claim_review_form.pdf
    • https://cdn.sqhk.co/furafurume/HXdBidp/tier_list_maker_download.pdf
    • https://cdn.sqhk.co/putizimetiwe/jhjiwFc/93335273647.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/66c84fe8-d5e5-40b1-b2ef-07ecc86c68b0/84292791551.pdf
    • http://lajirobodogew.epizy.com/86027727579.pdf
    • https://uploads.strikinglycdn.com/files/b1646f28-64ab-4b04-8591-ea6eac17102a/murozafitubenuvugavuke.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_4b783f57ba0e476b9568b4139a19f721.pdf?index=true
    • http://miwufojo.epizy.com/short_answer_study_guide_questions_lord_of_the_flies_chapter_1-2.pdf
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_11fbbc056c164e75b426e9bd8ec58d01.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bbb8cb17-34c2-454f-a455-1097fa7934cf/52383267950.pdf
    • https://uploads.strikinglycdn.com/files/f4a41f0e-f501-45c1-b395-eebe30719148/what_tools_do_i_need_for_cricut_joy.pdf
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_407c8be0095248ae87a81f5a3a228225.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ce5993db-c69f-413a-aa1a-69ad771e3a1c/42470367062.pdf
    • https://s3.amazonaws.com/wibedubosateg/cartas_abelardo_y_eloisa.pdf
    • https://s3.amazonaws.com/wobuzisibal/how_to_setup_d-link_dir-615.pdf
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_9d3ee6fc05a24b79a84240c7c665b6f6.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e790.bin
d88601c182309c4859cefff07f79e1e469b6aa660cf5c66893493af7fbea159f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 5444 bytes
font_01_sfnt_off0000fa0a.bin
c43f0c7e4aaad9cbf85fe0c80cdde9935fea778a685811b30e02f20a01794cc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 11160 bytes
font_02_sfnt_off00012002.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 4324 bytes

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