Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e85183cb9b180d7…

MALICIOUS

PDF

76.7 KB Created: 2021-03-18 14:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 64ecb7efb08ead29412e682800708bf8 SHA-1: af2bac529c5ce28131d08d33fcee1c9ee2000048 SHA-256: 1e85183cb9b180d7f0463010a21451c0cb6f69d493be900a35dcbab42a248948
136 Risk Score

Malware Insights

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

The PDF file contains a high-severity heuristic firing for a redirector link, indicating it's designed to lure users to a malicious website. The embedded URL `https://jumiwimov.ru/aws?utm_term=does+the+stock+market+open+on+christmas+day` is the primary indicator of this malicious redirection. ClamAV also detected the file as `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0`, further supporting its malicious nature.

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
  • 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://jumiwimov.ru/aws?utm_term=does+the+stock+market+open+on+christmas+day PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368979/normal_60177959620ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_6010d5a663920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458837/normal_5ff682b0ad797.pdfIn PDF document text
    • http://xidakuxekon.22web.org/mobile_legends_hero_guide_hayabusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_5fd8284b7ccfc.pdfIn PDF document text
    • http://tobalalupuvobiv.iblogger.org/cosine_rule_problem_solving_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_6044211bf3543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446152/normal_6006483b532e7.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/potamotaz/vifedorij.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/33027488061.pdfIn PDF document text
    • http://furekuvewokesi.rf.gd/bissell_cleanview_pet_vacuum_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/business_communication_chapter_11_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/discord_apk_8._9._7.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/sevofesa.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/96501963961.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/exercise_bike_weight_loss_results.pdfIn PDF document text
    • http://zeluzara.epizy.com/aprilaire_800_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/25514851639.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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 5448 bytes
SHA-256: 4caed84c3ab7f98f580fbf39a60d6a39b26c287a25fda3b785dcaea9759e3ad4
font_01_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 11604 bytes
SHA-256: ff69683106d369ad7a864fde87aeaf1b81b5a894082d736965bde1d60356f507