Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7dce7611a244e6…

MALICIOUS

PDF

83.9 KB Created: 2021-03-01 02:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 91959f3a1a58b6f328dbea06e40e063c SHA-1: 2cf17e2e28d03f84c7e5ab73fd0c50669585f858 SHA-256: 6b7dce7611a244e6d0adf602d721b0af29d613936be686b10b15b9a7b50ea3fd
246 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/bbd726.pdf.
  • 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.
  • 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://jacksth.ru/award?keyword=is+there+a+monthly+fee+for+verizon+jetpack PDF link annotation
    • http://gufutaca6.xyz/how_to_set_timer_on_intermatic8mait.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/why_did_they_get_a_new_cast_for_diary_of_a_wimpy_kid.pdfIn PDF document text
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/bbd726.pdfIn PDF document text
    • https://tunedewujanan.weebly.com/uploads/1/3/5/3/135345761/xoxowoje.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/yCidifh/lunurupupo.pdfIn PDF document text
    • https://cdn.sqhk.co/xezufulozuwo/gigigje/zokewosilamirewobasiliz.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/OSidQgi/gods_of_olympus_game_cheats.pdfIn PDF document text
    • http://hdsamara.ru/practice_ged_test_indianaeset7.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/rinivuraxurixijovafa.pdfIn PDF document text
    • http://strgb2.ru/vizazilitidobuduvaynhon.pdfIn PDF document text
    • https://cdn.sqhk.co/baxewoxevum/UhhfIXN/barcode_scanner_and_label_printer_all_in_one.pdfIn PDF document text
    • http://kreativoblako.com/56198185943wq58c.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/digibededemu.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/56207497884.pdfIn PDF document text
    • https://cdn.sqhk.co/fujigugi/hj5hgIr/sosapp_sos_emergency_app.pdfIn PDF document text
    • https://kefomituwo.weebly.com/uploads/1/3/2/8/132815939/jumunotegaf_vaxegop.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/90834896785.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/KGHEibd/60976110542.pdfIn PDF document text
    • http://f1l3download.site/wikudutimazilelupozewir63i69.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/57147987110.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/how_to_lie_with_statistics_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwedilejom.myartsonline.com/the_count_of_monte_cristo_short_version.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/78224581662.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_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 5544 bytes
SHA-256: a7c50eeedb715a5c1949846aa4eb2f82ff76e8433ffa02b52904674b2bb378b4
font_01_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 10812 bytes
SHA-256: 05b66c330fb4bbd60b45a116c805f2ae8c7dacc312ab91f53363890608eb73eb