Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a3c7b6df0259b2…

MALICIOUS

PDF

79.4 KB Created: 2021-04-08 09:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f1a19e19f005de081acce8cfd09765e8 SHA-1: 21477f5389975389358b0c74421339bc6008b997 SHA-256: d7a3c7b6df0259b28ac03bc97ef8aed8c354313d405c077c2dd8b412a7ac0cc7
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors and potentially malicious domains like jottigo.ru and 1fps.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to harmful content.

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://jottigo.ru/123?utm_term=ba+private+date+sheet+2019+ccsu PDF link annotation
    • http://1fps.ru/candy_crush_saga_2019_apkyxzvf.pdfIn PDF document text
    • https://cdn.sqhk.co/xozirijor/igjjjhS/salesforce_cross_filter_joined_report.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/chhjd95/vergoedingen_umc_zorgverzekering_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/ninuxoti/anQZgeJ/kefuwaxeraradukitigu.pdfIn PDF document text
    • http://arendagg.xyz/relion_blood_pressure_monitor_hem-741creln2_manualo2qrh.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://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_149a2901bc074e06bdab9087f87b3bc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/priston_tale_aging_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/zabarugavufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2573c65-2666-4f18-ad12-feca51865405/how_old_is_36_weeks_in_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4e608f-b37e-42d1-9d69-d8dfeeb24ced/35421902303.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_8bb000928870460c9dee3dc74c89e85d.pdf?index=trueIn PDF document text
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_5ad6b36fe2f24f258f2481c8f022a8df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/karrimor_footwear_size_guide.pdfIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_61b621ce909d4b25ab41aeedaf67bff9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisefowu/5s_lean_manufacturing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b5bfb1-bd82-408c-b629-1d27b4e85987/65562706042.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/dibeturuxovuko.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_812c28f42ad74d9b9740ab87964e048b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9136d669-f292-4b11-821b-8a1a7b8f1fee/nmap_cheat_sheet_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9367e4b5-50ba-4c66-88ca-dc16fd7ef173/25294266950.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_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5384 bytes
SHA-256: 61846fe2ccb64ededa1ec8279f99f41b88f10597afbb19250e1165d419408d94
font_01_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 10548 bytes
SHA-256: e50732dc3a711a9459c2f924b4475bde93db0bda1a02f22255e0d14d26729a43
font_02_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3