Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dc696e33691bfb…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 01:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bc38a95413322115ea980c43cc988405 SHA-1: afa0883472f63c583bb0a7ed95076e34c8e6fe83 SHA-256: e4dc696e33691bfb303fa2a1eee9b409e59ea10f6b23be30f1c23701db4d27ae
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing SEO-like keywords, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign, likely leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/award?keyword=marketing+budget+definition+pdf PDF link annotation
    • https://kazerefe.weebly.com/uploads/1/3/1/0/131070627/bujinakofawa-zodegujete-gujimogimonig-lunebudunuvadoj.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/87464955078.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/naleku-gopejasa.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/south_african_constitution.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/3360068.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/sananonatinib.pdfIn PDF document text
    • https://sekagerufelijet.weebly.com/uploads/1/3/5/9/135965199/gizujivonox.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/93727014140.pdfIn PDF document text
    • https://rofekituluz.weebly.com/uploads/1/3/2/3/132303072/fagofixalakovas.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/edac8086-9719-4e39-98c5-5177035c9f29/41892314768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad10af7-b05a-466c-9122-032caa43578d/youtube_crochet_shell_stitch_blanket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fcd0ec-afe3-4dce-ae81-d32f3ded197a/how_to_learn_guitar_for_free_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/wavolilojopogulebagipux.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/behavioral_interview_questions_and_answers_for_software_developer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e65645-2c4c-409d-945f-52b6768115ff/68081115219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50972599-0574-4c1d-ad63-46b4eff9cbf0/levuwasofar.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/falifakizuxawenerebizotik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2948dfa-c37f-4469-9ed1-51738c30d9c1/viwivuvojag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75118ce5-45c2-4116-9068-cb73295c4042/36107103239.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/82363386635.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/24939195774.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/74130950705.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/nupijutezeredenu.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_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 5208 bytes
SHA-256: ed49e0ff56e5b7f1c09f1f329b322b2541f8318747f9ced3c9b1c3a4c1f299d5
font_01_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 10784 bytes
SHA-256: f9d932baef2a9e3f87ca4c44823608476ab5ce4a4092abd746c2b4f437b8ff70