Malicious PDF — malware analysis report

Static analysis result for SHA-256 728ddc5e6f80ead0…

MALICIOUS

PDF

82.5 KB Created: 2021-03-20 23:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4f5b84ae20b07593f2d5738f31a065e3 SHA-1: 7bbe0583aaceb6de68f8b20560a434a8b194f21d SHA-256: 728ddc5e6f80ead001d9b877c1754fe799228d3918bdc48958dfd4b828517b79
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The document body, though heavily obfuscated, suggests a theme of free movie streaming, likely intended to entice users to click on the numerous embedded URLs. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/aws?utm_term=a+dog%2527s+purpose+free+movie+streaming PDF link annotation
    • https://cdn.sqhk.co/koxopumo/iiY64Gg/28727014134.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/srs_light_honda_crv_1999hvrj8.pdfIn PDF document text
    • http://55571.ru/descargar_antony_santos_bachata_viejaexj39.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/uhjjd4M/real_gem_mines_near_me.pdfIn PDF document text
    • https://memagakotis.weebly.com/uploads/1/3/4/7/134760483/215413be.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/1049818895b6a3.pdfIn PDF document text
    • https://vinadesafabav.weebly.com/uploads/1/3/5/3/135305522/163de26c258.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/fd0933345b98.pdfIn PDF document text
    • http://akb54.ru/how_to_clean_mold_out_of_humidifierkfh95.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
    • http://xegefonupekowa.epizy.com/85190971093.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_d874e8069f56406cbf06583a7e3144a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73122c5-5dab-4dc8-a8a2-8315c48373fb/22473507959.pdfIn PDF document text
    • http://semofif.epizy.com/can_i_make_a_smoothie_with_almond_milk.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_cbdf182ca5144d67b089b28e6267b3be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5daaac1f-f581-404f-a479-6e7194f7081a/zewepoguwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50c8493-5333-4d2b-9a61-c7628bf87d4e/sahih_bukhari_book_59_hadith_661.pdfIn PDF document text
    • http://nogobixa.epizy.com/dujobotenitulesivuwo.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_c265f5b03fcf4720aca2f64db11fe291.pdf?index=trueIn PDF document text
    • http://dufijofitaj.epizy.com/zofudajapifipusuz.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_5cd2fe6a73184deb9ca21e42703d4b02.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 5292 bytes
SHA-256: 72f4a23f9927317228d4eb25f05ff3f43a678f5ca530faae3ed19bc2da48147e
font_01_sfnt_off00010957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 10920 bytes
SHA-256: 56b23a91355bbbb7f6137f2027851b732033dca02581d18f2b313fbf4c9f73ca
font_02_sfnt_off00012e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378