Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b9ae98dde22ec7…

MALICIOUS

PDF

75.1 KB Created: 2021-03-20 23:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad06233399f2eda3b219fd80bf95d926 SHA-1: c3be30816322cebd04acdd509f4d35351fd4d645 SHA-256: d3b9ae98dde22ec71820c6d8507947fb0270d9135aeaea776c4893e05153c522
106 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One high-severity heuristic indicates a PDF link to an algorithmically-generated URL, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://midufefew.ru/award?keyword=alter+ego+3+b1+cahier+d+activit%25C3%25A9s+corrige+pdf PDF link annotation
    • http://nunobuzipame.medianewsonline.com/jobuwajuli.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/1495259111.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444098/normal_600869e941dc7.pdfIn PDF document text
    • http://rirenanevigi.22web.org/l4d2_weapons_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498801/normal_6029c6615960d.pdfIn PDF document text
    • https://lumigoxodavi.weebly.com/uploads/1/3/1/6/131606620/5207101.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/s3_bucket_encryption_terraformqo4cf.pdfIn PDF document text
    • https://karaxofuko.weebly.com/uploads/1/3/5/3/135344752/gelidejotoma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fdd7231232ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474723/normal_5fcb2afc5b058.pdfIn PDF document text
    • http://jobware.pro/vajefigaxezovoduvosopez4d6b.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/lilizasixejoxoso.pdfIn PDF document text
    • http://kaxitijidopu.iblogger.org/battery_grip_nikon_d5100_original.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_600cab875e91f.pdfIn PDF document text
    • https://lafozevu.weebly.com/uploads/1/3/4/3/134378288/a16161.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://pizenusogusu.atwebpages.com/brain_on_fire_free_download.pdfIn PDF document text
    • http://wadikujadav.epizy.com/tefagajonakow.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/93240887969.pdfIn PDF document text
    • http://rijimilaje.rf.gd/nepufojemipuwigozuferaz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 5648 bytes
SHA-256: a17000edebd6e3c12b7b3df17c577ed621b3c15806eac5548fde856b9fb77169
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 11460 bytes
SHA-256: 0c60ad8b9ee5e3d967469ed9ce60504247da60b99e63ee0df93098e6c788a592
font_02_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378