Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08291b637076f97…

MALICIOUS

PDF

106.3 KB Created: 2021-03-05 06:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 45761c7c82f053ecfaa8ed27351dafcc SHA-1: 08b32af7e0dc615c521d6cde81d20a5bccbd165a SHA-256: a08291b637076f97291362f3809a15afe80eed04c9a733f54d90c360607998c2
194 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 are hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://leonvi.ru/aws?utm_term=bmw+e90+dash+service+symbols PDF link annotation
    • https://babekezuxosonat.weebly.com/uploads/1/3/5/3/135327288/d80231a19a85.pdfIn PDF document text
    • http://worldthailand.fun/possessive_nouns_worksheet_for_grade_3v3yvy.pdfIn PDF document text
    • http://vamoktin.ru/blacklist_season_1_torrento7hks.pdfIn PDF document text
    • http://koteyarn.moscow/windows_server_2012_r2_inside_outfdrx7.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/craftsman_belt_disc_sander_repair.pdfIn PDF document text
    • http://copyrighytsupport.com/38113904232ohqxg.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/lepagutifaj.pdfIn PDF document text
    • https://gunisuzafi.weebly.com/uploads/1/3/4/3/134311694/figosalojoma.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/3937806.pdfIn PDF document text
    • http://bt-management.website/how_to_download_adobe_premiere_pro_2020_for_freeipu86.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/weed_eater_featherlite_xt200_spark_plug.pdfIn PDF document text
    • http://namelesssouth.xyz/61730976687fg9wb.pdfIn PDF document text
    • http://ovca.space/85396743209nj9k2.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/ziwonipimapi-mibipuponubo.pdfIn PDF document text
    • http://copalofa.site/resetear_toner_brother_hl-l2360dwa9amw.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/control_systems_engineering_entry_level_jobs.pdfIn PDF document text
    • http://zifujujefilat.iblogger.org/65273764947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_8917b922353147de9ebe5a4eae6d0fe7.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_1f05a0517bab4d79906342e85abca52a.pdf?index=trueIn PDF document text
    • http://zazuxevepiz.rf.gd/fifty_shades_of_grey_freed_soundtrack.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/68655384845.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_a243c7616270461a9ec8897e0e3ab5f5.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_63038843d86f4cc7bf4f7d783ac7cd2e.pdf?index=trueIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E10 5920 bytes
SHA-256: c0dd4004623e58965702b6b992e2c2ff91ef88b1f88fc5b36f3958b9c84c84bf
font_01_sfnt_off00016213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16213 5916 bytes
SHA-256: 7757fc70e66627955fe0d17014d6178a2658840e58e16424059e048f0fafa0cc
font_02_sfnt_off00017132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17132 11956 bytes
SHA-256: 96d5421d9dcf181ff5a3f60fdc0fe5258dcfc1f4b0a0201f1c80a52a012edbca