Malicious PDF — malware analysis report

Static analysis result for SHA-256 994e0fc7cd16daea…

MALICIOUS

PDF

76.5 KB Created: 2021-03-10 11:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a2642d3bda7288cac1298f1581c7b31 SHA-1: 578db06e625538a8c233d73317d8580be8f98c15 SHA-256: 994e0fc7cd16daeaf56d58151d8f0bff40c6e8c0ec788bea8077602d1aba10b2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The document body, though heavily obfuscated, contains text related to an 'admit card', which is likely a lure to encourage users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=haryana+lab+attendant+admit+card
    • https://borobufa.weebly.com/uploads/1/3/1/4/131406827/1035119.pdf
    • https://lonegaru.weebly.com/uploads/1/3/0/9/130969637/wazatetu_ribulanaboladib_lalawosekitup_baduf.pdf
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/zugar.pdf
    • https://vuxomikegivu.weebly.com/uploads/1/3/1/4/131453843/kesina.pdf
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/pogowoxazavuva_komanisikeg_wopuv.pdf
    • https://rolorizumi.weebly.com/uploads/1/3/4/3/134316308/149f8b23d.pdf
    • https://cdn.sqhk.co/zepipawetopi/giFV8ge/tiny_bubbles_laundry_baldwin_ga.pdf
    • https://cdn.sqhk.co/bexoninodag/jcDidJh/zombie_assault_sniper_apk.pdf
    • https://cdn.sqhk.co/surudije/jivgigc/aaron_appliances_starkville_ms.pdf
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/0618a4e909e06.pdf
    • https://cdn.sqhk.co/dusawugivepo/8jfhwjf/wemekakabesepowogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zumomasugipeno/buzukivel.pdf
    • https://s3.amazonaws.com/wanasuvedigo/best_airplane_fighting_games_for_android.pdf
    • https://uploads.strikinglycdn.com/files/f468ff81-270f-4540-a9de-b2098425503b/what_order_to_watch_the_girl_with_the_dragon_tattoo_series_english.pdf
    • https://s3.amazonaws.com/gagotaniwipure/temugume.pdf
    • https://s3.amazonaws.com/likerajatob/what_does_arc_mean_on_a_receiver.pdf
    • https://uploads.strikinglycdn.com/files/7ba39f20-5430-44b7-9b4a-4428b64d900d/disuteruzun.pdf
    • https://s3.amazonaws.com/vavejijitatofu/647846150.pdf
    • https://s3.amazonaws.com/davawina/cinderella_broadway_dress_transformation_gif.pdf
    • https://s3.amazonaws.com/gazijewevan/piriformis_muscle_exercise.pdf
    • https://uploads.strikinglycdn.com/files/22adf95f-2aa7-487f-9766-83be2316ed5d/1339568537.pdf
    • https://uploads.strikinglycdn.com/files/a79c23f1-bc7f-4bf7-b902-48ea8539b747/93014422572.pdf
    • https://s3.amazonaws.com/zafibimutadoti/dekinagimeles.pdf
    • https://s3.amazonaws.com/dovulavavo/rusalixopogo.pdf
    • https://s3.amazonaws.com/donarepemi/be_with_you_city_harvest_chords.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2a.bin
bc0723c20110a53ae772aec5a503f9063b4187ee6d36d3f502d5a319ba918e04
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 5112 bytes
font_01_sfnt_off0000fe79.bin
86478fa4d415da77c776c74dc035e39de77b5faa30d3a5b2007875ee7cf4083a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 11140 bytes