Malicious PDF — malware analysis report

Static analysis result for SHA-256 efec9d16e016d22f…

MALICIOUS

PDF

86.4 KB Created: 2021-04-12 05:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e90a102dba2f75625f768ca97127f738 SHA-1: 61f99d32d90c1fa16b15266ae17e5701a04dc931 SHA-256: efec9d16e016d22fc5ed7e243831b0a31d5599a17090c7e0bc2bbc832b9fcbff
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, with one prominent URL pointing to a suspicious domain ('druttle.ru') that is likely used to host a phishing page or a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to a 'crock pot express xl', which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=how+to+use+crock+pot+express+xl PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391921/normal_602c9f8a7871a.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisezepemu/jxtgcij/90304430810.pdfIn PDF document text
    • http://tokiridevifo.medianewsonline.com/midebufinugawifef.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/zaganak.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/68780927515.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/scansnap_s1300i_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/gge1ghT/fairy_party_decorations_amazon.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/acute_pancreatitis_treatment.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5fe4aac22a14e.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/nqVid21/78904774635.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/39268273052.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/m68jgfi/xokepaxizifafus.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/51X0fss/puzzle_dragons_anime_wiki.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/75284757254.pdfIn PDF document text
    • http://jebifawulu.mywebcommunity.org/agile_principles_and_practices.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6d0714-3d7d-4002-b68b-13792de0c927/how_to_unlock_avaya_1408_phone_without_password.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_472892e3f16341269966ed385401d651.pdf?index=trueIn PDF document text
    • https://aaa8450b-5959-4376-bf95-5e5e4b45aab3.filesusr.com/ugd/bcfc74_827d6176758d49fc89f4461c18066326.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_0ad1c381cc8e489ab00da72eeed55d8d.pdf?index=trueIn PDF document text
    • http://makakanow.onlinewebshop.net/74928249060.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_d7de6b51c9494a4d80c56846fc9633e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31aa8c5-bc79-4e5b-8dd8-33208e0cb58e/14799564709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ccabf5-b5c7-41e2-9b57-ccfcf6220f0b/lefubupurewunezufuleba.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/what_is_seth_gold_worth.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_d0fe7b7cb46343dbb276a687c0db5249.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001156d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 4904 bytes
SHA-256: ab93cd4248bd61dc24a60cc289dcb87c8f4660f4e87aaa83679b00f91c9f9ab3
font_01_sfnt_off00012645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 11276 bytes
SHA-256: 7361c8bf3a4ffa770ffb369ec80375a6128c707af319209f91b731c16b73322f