Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cf0127ec0c5bd0…

MALICIOUS

PDF

80.3 KB Created: 2021-06-08 17:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4c699a8f89552999814b6d54e1fff908 SHA-1: cd5dbd1bdc475f71628beb83415cc332566a24ce SHA-256: c9cf0127ec0c5bd0c14bb3ac7b751bc56ac997a52701802f933ee888db53d8d6
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a link farm on disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to a malicious site. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 4

  • 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://irlanc.ru/pbw?utm_term=parabola+general+form+to+standard+form+calculator PDF link annotation
    • https://xunaliniwer.weebly.com/uploads/1/3/1/3/131398540/mezajir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456985/normal_5fdb8ddc74473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_601e64aeb2e6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_606e44b998654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_60bbd1f6dba8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_5fdc56004f38f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464995/normal_60b197d299cf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5fec5a35b0cd9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4380522/normal_60b344f6e1da5.pdfIn PDF document text
    • https://bajewenizuku.weebly.com/uploads/1/3/4/4/134475359/421202.pdfIn PDF document text
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/5655748.pdfIn PDF document text
    • https://dosijasapuzab.weebly.com/uploads/1/3/4/7/134702057/7fbb209ab6312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144495915/frigidaire_ice_maker_user_manual.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/21141443914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5424ff22-ec9a-4771-81aa-8ec4c9bc6ce9/how_to_know_my_kotak_debit_card_number.pdfIn PDF document text
    • http://xanosisa.pbworks.com/f/jiwutetatutekoliropan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f71cbf-6d52-4797-9f6e-5abf8efaa37f/craftsman_lawn_mower_carburetor_repair.pdfIn PDF document text
    • http://vaporezikumu.pbworks.com/f/download_apostle_joshua_selman_messages_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8540a833-0c95-48b7-b06b-43a164010978/what_does_it_mean_when_someone_says_yes_please.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144684981/how_to_use_possessive_adjectives_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd89409-3373-4580-afd6-693c642eabd7/the_name_of_the_wind_online.pdfIn PDF document text
    • http://nijominem.pbworks.com/w/file/fetch/144607701/doporegeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf4093b-f693-4151-8147-3e91646d0557/cyber_weapons_shadowrun_hong_kong.pdfIn PDF document text
    • http://tazusun.pbworks.com/w/file/fetch/144829068/how_do_small_businesses_keep_track_of_expenses.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144671466/59710598039.pdfIn PDF document text
    • http://ronefete.pbworks.com/f/solotureruselagoteremapas.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_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 4556 bytes
SHA-256: f0f612345b7b6e877fcfc12740d11826770e50e164a7c1dc23fe784d64c843a0
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 5484 bytes
SHA-256: e64626b0e7f4aa85d7d3f2c38097d683c37b8188b514d7011ace690e4817b5d4
font_02_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 11536 bytes
SHA-256: 24a2f5163ec4052f2caa6a94c5a5d15d1e2b9ac12260b478614beeec538bb9de