Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f7a89d434f9231…

MALICIOUS

PDF

178.8 KB Created: 2021-06-03 09:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b285a825deec899d015e5c65bddb456d SHA-1: 2cf78224b2e41be2858a8e39be89b48384dc1bcc SHA-256: 62f7a89d434f9231adf792492c5b3833d506173ce26a29b887abdb464e460adf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a social engineering attack to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://krisoc.ru/pbw?utm_term=what+are+some+similarities%252Fdifferences+between+mercantilism+capitalism+socialism+and+communism PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386330/normal_6050fcdf76512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_60b7db4a8ca7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_6049178e94085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_6056dac43421c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_604e106147889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495985/normal_60253b04c4642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_60683c19f3721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418184/normal_5fcdee06dfcf7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144532179/38191626251.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144419070/77559390916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f5f642-50f2-4997-a0fb-75c873ce34f0/84143047380.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144507573/channing_tatum_pony_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87da207b-f7c8-4848-8c78-553931b3b11a/how_to_read_a_landis_gyr_e470_gas_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c84b791-6338-4be8-8b89-6541f242379d/horngrens_financial__managerial_accounting_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b1a0e3-1a81-418c-8f4f-3db28472e969/rividifob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf0a7b9-9786-4dd6-8e0d-940c4757d0c3/nawusigezilisufeverexus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee5da59-a4e3-4871-9524-6995a8f51d6d/how_to_smoke_a_brisket_in_a_brinkmann_electric_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a03020-c4fa-4cb5-9f9a-3a1857b1bf40/pewupaxibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3473443e-ba8f-4003-ad6b-524598e6f146/lizavokozexijabiwomujere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cadfbc-39a0-4b31-a273-e9bceececaa4/pavapipizijuxokafunil.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/144427104/planet_earth_caves_47_minutes_2007_worksheet_answers_key.pdfIn PDF document text
    • http://supijexed.pbworks.com/f/harpers_illustrated_biochemistry_27th_edition_download.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_off00027e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E87 5676 bytes
SHA-256: a98424742dd505c5b76c4d02bcfcb4a5a3b4fef4bf46aca0247e3e8ad150dbb4
font_01_sfnt_off000291c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x291C5 13076 bytes
SHA-256: 0d2e7516f747e2095811997a1509e622c800feae51e4ba8b7486aae3e07e6afc