Malicious PDF — malware analysis report

Static analysis result for SHA-256 29349c00739512f9…

MALICIOUS

PDF

74.8 KB Created: 2021-05-24 18:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 028a11147120e655c627c143be4d28df SHA-1: c0e786de196f2c7882018a684179458305565f9b SHA-256: 29349c00739512f95dc6e6d5df20fc4ad1b737ed867024c9dcd522b94b37ea59
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to a redirector URL (https://baarspo.ru/strik?utm_term=what+is+automotive+electrical+system+means). This behavior, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=what+is+automotive+electrical+system+means PDF link annotation
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/bivililawoxujebiviw.pdfIn PDF document text
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/panelebuwitov.pdfIn PDF document text
    • https://rowexajezer.weebly.com/uploads/1/3/0/7/130776500/vegezowiz-kugamedu-vazugepoguvuz-guvovizezisubet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460476/normal_5fd837817fb46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_601395901cf81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5fe26815ead04.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/3501022.pdfIn PDF document text
    • https://jelebemurufipo.weebly.com/uploads/1/3/4/4/134442628/43d34dcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480594/normal_5ffd73b87b4ab.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/zoromexemuzid/19892441571.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/what_are_three_things_you_like_about_yourself.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/rejamuvexefom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e8fff4-cebd-4cc2-af05-2c85d84477ff/vijulasijufibo.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/how_to_manually_drain_a_samsung_front_load_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/battery_calibration_root_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/42118704559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee45841-8e71-4fe6-a69b-43c07aa62534/introduction_to_data_science_rafael_a._irizarry.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/business_letterhead_word_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/calibre_font_family.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_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 5212 bytes
SHA-256: c20428ccb0abd4415705749853465bf1478e268a04f0bc04387872d845f697f1
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 10972 bytes
SHA-256: 11b966fc021bececda52f31523aa1f5bca3d7f1665fb2a02c79576698ae78004

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