Malicious PDF — malware analysis report

Static analysis result for SHA-256 157ccef4d2e309f1…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 16:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7ea0ce16e1d5bd09c2855bf097f1d8ea SHA-1: 284aa28a4255209a23dfc2a21e1333f3be3dd051 SHA-256: 157ccef4d2e309f194e2ea007d5283a2533d68b897a903ad604b0154edcfa3d2
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/wix?keyword=pro+asp.net+mvc+5+platform+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418175/normal_6054ee816736e.pdfIn PDF document text
    • http://wilozobugo.iblogger.org/diary_of_a_wimpy_kid_long_haul_full_movie_watch_online_free.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/murogagovasoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_603b9428e5df6.pdfIn PDF document text
    • https://soregoba.weebly.com/uploads/1/3/0/7/130739918/5718189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_603854e9cd827.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/2873605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_6046aabbcc4ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427105/normal_5ffeb5b66eac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fee520198d25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418991/normal_60033a6d4def8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_600b342453af6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_602af0f0466df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowivopikuzud.epizy.com/assembly_line_android_game_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f13d009-0107-4483-928a-4bdfbd9585ee/sonesoxuwijudej.pdfIn PDF document text
    • http://lodafudamisov.epizy.com/anatomy_of_head_and_neck.pdfIn PDF document text
    • http://zavivemigowoson.epizy.com/titajabiwareseginimemasu.pdfIn PDF document text
    • http://zowedejiwut.epizy.com/cabeza_de_vaca_la_relacion.pdfIn PDF document text
    • http://jigosip.epizy.com/liwegaxemopewuteji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68bc6cb8-b1a3-44aa-83b1-54b9f63ac534/where_is_goddess_statue_in_kakariko_village.pdfIn PDF document text
    • http://mexesumofiruvaf.rf.gd/82661679450.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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 5520 bytes
SHA-256: 43ed641fd640a9ef19ffb1da0cdc8196c8a37cf89d3358a9d6dc44488ea5d028
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 19804 bytes
SHA-256: 7090ea2ed6ebeb3d2cb585b1f768dec7bfaf5e02c8351e89e0a089d3ed7c290f

Open this report in the interactive analyzer, or submit your own file for analysis.