Malicious PDF — malware analysis report

Static analysis result for SHA-256 705ed35b25579fbd…

MALICIOUS

PDF

71.8 KB Created: 2021-04-06 16:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 94b776fe09fbe992152ab417a442dbb4 SHA-1: ed82780872e1cac5cc4be4dcfdda20409125d840 SHA-256: 705ed35b25579fbd34502bac5ef6b54b4c67f822d8ec0222f7d40500322b114a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains and are likely part of a link farm or SEO abuse tactic. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing or trojan threat. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+learn+dental+work+for+free PDF link annotation
    • https://cdn.sqhk.co/tatogevi/b4Ojchb/slices_pizza_bel_air.pdfIn PDF document text
    • http://xteenware.online/870316408153n5d2.pdfIn PDF document text
    • http://prostosite.site/10102845838e3vzv.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/MQifiiY/real_drift_car_racing_apk_mod_money.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/lirefimidanawojuwefa.pdfIn PDF document text
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/1de00380db232c.pdfIn PDF document text
    • https://wutaleba.weebly.com/uploads/1/3/5/3/135390467/1382060.pdfIn PDF document text
    • http://soldonlakewood.com/sekamizezots9w7w.pdfIn PDF document text
    • https://cdn.sqhk.co/kadukugobug/vNidhaV/nyse_stock_market_graph_today.pdfIn PDF document text
    • http://sethel.xyz/9648152467749xsz.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/neYoxT3/benecard_prior_authorization_form.pdfIn PDF document text
    • http://reawont.online/org_chart_template_powerpoint_2016c7bdb.pdfIn PDF document text
    • http://begemot.space/buxokapadefelobujulatinupy5tut.pdfIn PDF document text
    • https://wuxuvekukiku.weebly.com/uploads/1/3/1/3/131380251/poroja_fababorisi_dabagesu.pdfIn PDF document text
    • http://appeal-ig.com/can_chromebook_memory_be_upgradedickto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxulija/dungeons_and_dragons_3.5_character_sheet_fillable.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/star_trek_screenplay.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/zotatupibixuzugomimaxaje.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/jedug.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/dinawozubajulokubofetosu.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/ninomobi.pdfIn 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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 4840 bytes
SHA-256: d6dbca3e411b3474a8e032ea84048089d089f49cdef3c86d2d3d8163030230e4
font_01_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10304 bytes
SHA-256: 88bfe4a837b8ec227fa1171301e0765fde603006a6f37ec460fdecb9ba14aed8

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