Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec5ac5916c97623…

MALICIOUS

PDF

78.2 KB Created: 2021-05-12 02:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 94b3ebcf1e5e245fdf08d7ac2b74e21a SHA-1: cfd6c91918db0ed0462e6c4f807fdc21e2ca5b48 SHA-256: 7ec5ac5916c976232cf92df2452296c85d25b627e97f3db204eb12901f3caa0a
186 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. 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 0.9961

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.
  • 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://fokemale.ru/strik?utm_term=lg+led+tv+repair+centre+near+me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369775/normal_5fdd87d6b0836.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/MB8ihJK/xedozivak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_6039069d9af72.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/9o8zxmp/free_poker_sites_texas_holdem.pdfIn PDF document text
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/peseki-fajer.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/c369bf876aba9.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/GyiajgE/75541752328.pdfIn PDF document text
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/3592238.pdfIn PDF document text
    • https://cdn.sqhk.co/riduwadanu/hYVjhGR/agisoft_photoscan_1._4_5.pdfIn PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/7192873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_5fde8c64dcfd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_603e6fc00b879.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/eXififD/led_colour_change_rgb_light_bulb.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/hipvHbe/chinese_checkers_2_players_same_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/HKlzhcT/5286559425.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/Jjb4idF/all-_star_fruit_racing_vr.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/AJgjKny/buruxebajixixusabazavata.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/iegXmqW/rufosakarizi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gugakalorezo.epizy.com/fivewivonudoresajexuz.pdfIn PDF document text
    • http://gotazuvibidok.epizy.com/7934278997.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_f300151ba52e4bacac9af1505594c4bd.pdf?index=trueIn PDF document text
    • http://zororeka.rf.gd/3553530897.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_7106acc8b12743a3a3759b36287b8fd7.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_b95b19e6df854098b30703f3a58a19ae.pdf?index=trueIn PDF document text
    • http://vibuziw.epizy.com/82930788208.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_04222b4e5b524c91919affbfc3e6f0d7.pdf?index=trueIn PDF document text
    • http://jebikowi.epizy.com/pdf417_barcode_font_ttf.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_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 5216 bytes
SHA-256: 14c8087e50aa97efcc81f9b39087030472805397890d8872b9e92a0dfbdfddb9
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 11568 bytes
SHA-256: db8f74c7a6951ab32f81680a97e0bb76f5a937c3c21dd7e7d447c7daf1e265d0