Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda0f7851faa4b56…

MALICIOUS

PDF

77.3 KB Created: 2021-04-09 06:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1cbae2699df5b25eb421f4d4666d9254 SHA-1: 2bc94461cadbea500f7a6597645d52d2e4dd347d SHA-256: dda0f7851faa4b56f2a27f864d477d535fb0b11650333feac8e35480e7f407f1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to suspicious domains. The 'PDF_SEO_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely for SEO poisoning or to host phishing content. The ClamAV detection and ML classifier further support the malicious nature of the file, suggesting it is a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=excel+vba+function+return+array+type+mismatch PDF link annotation
    • http://mxbur.fun/ggbs_based_geopolymer_concrete_pptzdgf9.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/anet_a6_manualvyoj0.pdfIn PDF document text
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/2bd40e617238.pdfIn PDF document text
    • https://teselabobebivu.weebly.com/uploads/1/3/1/6/131606188/4124805.pdfIn PDF document text
    • https://bulipegorevuju.weebly.com/uploads/1/3/4/7/134700868/puvezujas.pdfIn PDF document text
    • http://jumbochecker.com/scary_anaconda_pictures52ms5.pdfIn PDF document text
    • https://bezixaror.weebly.com/uploads/1/3/0/7/130739980/leduv.pdfIn PDF document text
    • https://tagufonatudivar.weebly.com/uploads/1/3/4/6/134609106/448f22fcc743.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/gawiwedajab_tidodobiroj_jawovazeno.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://lotekine.weebly.com/uploads/1/3/1/3/131381428/d5021300738.pdfIn PDF document text
    • http://skidki-day.site/puzzle_bobble_2_character_select5s2el.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
    • https://s3.amazonaws.com/figidireki/47336488138.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/zoduviti.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/2008_chrysler_sebring_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/instagram_icon_jpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68895e3d-f538-4210-b72b-145ad6ecf26c/87425618225.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/fepujivapaxefafububiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c6056b-ba44-4eb9-a9e7-88a2fa810fb2/a_discovery_of_witches_season_1_episode_3_subtitles.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 5464 bytes
SHA-256: a170cc3050d42bb77abe1a7ba2ea3b05d9edb47f4bb3eb94a0088317a9f07653
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 11016 bytes
SHA-256: ad52007dba18bc6b1aa166f9bb3b81520d40b7f7245e1b63018f328fa2bb803b
font_02_sfnt_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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