Malicious PDF — malware analysis report

Static analysis result for SHA-256 2344a1519edaf710…

MALICIOUS

PDF

74.4 KB Created: 2021-04-30 16:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a8a0a6296c532d2fd1a60e546c6aa22c SHA-1: 920c6aa79b5940650a02cb0b8ccc65e0c84c7a18 SHA-256: 2344a1519edaf710217a2eb487b8d08f1e1fda4561414ad96fd7eab3b64f682e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

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://xajibur.ru/strik?utm_term=homeless+bird+summary+chapter+2 PDF link annotation
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/gofegemesojaj.pdfIn PDF document text
    • http://uaregroup.com/limorinisibetibuvivanoos8ou.pdfIn PDF document text
    • https://devegiwosoti.weebly.com/uploads/1/3/4/5/134592662/zedavedonejosaj.pdfIn PDF document text
    • https://bifuvabomefu.weebly.com/uploads/1/3/0/8/130814245/pipezifuna-pejutedositup.pdfIn PDF document text
    • http://prizinsta24.space/manga_like_re_monstervedl0.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/murekekifawaj.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/magewixu.pdfIn PDF document text
    • http://tibetterrier.ru/kidesifovomn6e4.pdfIn PDF document text
    • http://olx-delivery.cc/bosimedaninolopulepixu13pw.pdfIn PDF document text
    • http://groby-ritual.online/tebolovivixef04qn.pdfIn PDF document text
    • http://webdefilmizle.com/ny_state_2nd_grade_math_standardsb8zya.pdfIn PDF document text
    • https://bavefazetujew.weebly.com/uploads/1/3/1/4/131406687/zekuzixejaxifexew.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/3e6c5c2d1.pdfIn PDF document text
    • https://zotepuzexalebox.weebly.com/uploads/1/3/5/3/135397030/sufowa.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/rurunevezaxemo.pdfIn PDF document text
    • http://molotkov.site/statistics_for_managers_using_microsoft_excel_7th_edition9arfd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/better_twitch_tv_emotes_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/helene_cixous_the_laugh_of_the_medusa_book.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/algebra_nation_workbook_answer_key_section_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71ba9f6-7cd4-4762-837d-eb517a8d41a2/nuzudoxozopogaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad6e43d-a1f9-432a-834d-c22b7e4e7d1c/79010190993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3235da6c-3e9d-4795-9d94-73c8de914a7c/5615066994.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/apply_online_form_2018.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_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 5648 bytes
SHA-256: 84690999e2570101bd1b4bae9d1c2ffa0e985ef32fc79a9daebffe0fc8b8fa34
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 11092 bytes
SHA-256: 6129aa39d6605634f5458b0880a2912655300b994abf2003d340cbcf308af905