Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef09d6391752950…

MALICIOUS

PDF

125.7 KB Created: 2021-04-08 05:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5f189513932a3d5688a25cd6faf30531 SHA-1: 81d58bddb40f6b3e54961c37512b86492e16fe9c SHA-256: 7ef09d639175295066ff4040680c7f833037f156234e16ae44f7489b215228e3
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 0.9988

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://dafemum.ru/123?utm_term=xsl+template+cannot+be+a+child PDF link annotation
    • http://insurancesouk.com/39366306567i9yaz.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/ihhagjW/48179962737.pdfIn PDF document text
    • http://ukrinsure.com/ruzimizijez5fyi0.pdfIn PDF document text
    • https://cdn.sqhk.co/gojaxaxiwa/ghhuicB/enyopro_exercise_bike.pdfIn PDF document text
    • https://cdn.sqhk.co/nisosawero/hbYhiib/jotewikawadevito.pdfIn PDF document text
    • http://libralab.digital/3105891510qcppg.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/5ORNhgT/funny_ringtones_for_iphone_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/bZjcggu/trick_shots_puzzle_games_unblocked.pdfIn PDF document text
    • http://sanasojan.22web.org/953865526.pdfIn PDF document text
    • http://shop-you.xyz/34882547752nxjm1.pdfIn PDF document text
    • http://firstsecu-paypal.com/7531516976610b47.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://s3.amazonaws.com/nakuzafol/jet_jj-6cs_jointer_manual.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_b024cf832dca480ab4c9c35c27ec4a34.pdf?index=trueIn PDF document text
    • https://2df7536a-ab64-4dd3-a6ca-98e0eca144a4.filesusr.com/ugd/de578f_96611bc72c1d49379ebc38c55476b34c.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_0f8b092bfaea4bf8a3d5baa2a9989c6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mixanaz/chadariya_jini_re_jini_song.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_4a5708bf6fc949469d5134b6aef1b940.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_f33dbb51e9104ff598dfbde3fa9352d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/breaking_bad_imdb_parents_guide.pdfIn PDF document text
    • http://ziriboxemo.epizy.com/ryanair_app_for_ipad.pdfIn PDF document text
    • http://xugonowelimije.epizy.com/meeting_agenda_templates_doc.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_bf0aaecfdd864b5485d07f2bd1d02fc5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/monekuvib.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_off00019c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C74 5120 bytes
SHA-256: 3aa3b17037295f57de5a1b279ad0831e6542a2612ccf9b0b1d49f2d3678b080a
font_01_sfnt_off0001ad99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD99 13540 bytes
SHA-256: 9cb3151f457aacbd100a9b80dcb6abd225e0a2b526b1ec29fb99c14a0bb5c44e
font_02_sfnt_off0001da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA7B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c