Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0dba78c5532d06…

MALICIOUS

PDF

69.5 KB Created: 2020-12-23 15:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6c03b4251da9723340cb2a0d47010dfa SHA-1: 4e8a2d91858c8df66fb47a945d25ae992d6b0c5d SHA-256: 9f0dba78c5532d0613cf9cca9c20adf774e1a1a8a4da1da160d0cacfa53c01a0
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains a large number of external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of 'utm_term' in one of the URLs indicates a tracking mechanism, common in phishing campaigns.

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 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://traffnew.ru/strik?utm_term=ice+cream+lyrics+blackpink+meaning PDF link annotation
    • https://funefazadoma.weebly.com/uploads/1/3/4/6/134648765/3381010.pdfIn PDF document text
    • https://bapumuper.weebly.com/uploads/1/3/1/1/131164114/ganosewuferebuwigut.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/fabokufavibapafeb.pdfIn PDF document text
    • https://zetoruribafepa.weebly.com/uploads/1/3/1/4/131452904/nerowofubatexatopin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_5fc2eda3ee8c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485703/normal_5fba57cc44937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_5fa0e94aa721a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_5fa6c049f3235.pdfIn PDF document text
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/gowigasokefoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f9007fd0a29a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fc8385558fac.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/5e20c36439039.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5fe15939b0a04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b62f07-4ed3-4c7e-ac4a-0d99a6d55520/cuidados_de_enfermeria_durante_el_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c79356a5-54d9-424b-b300-a4d2ec4084ac/98964691532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd29848-4b4f-4939-b2c2-3438d5269b08/22396212225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef65e815-f128-48ea-aec8-dbe8f1e66ac9/99281499405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff8509c-8bb9-4112-8dc4-ac08b3158ba7/gelosasonoxadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199ddc5b-646a-4ea1-8407-3b89a7ecce03/tavopotarojodatuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ff728c-2e2d-445b-a5bc-b46c6afb8246/pittsburgh_radio_stations_playing_christmas_music.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_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 5496 bytes
SHA-256: 039603803021530902b1c0185f50ac1f3f51de65dd5de0ce6f8f86286583eb45
font_01_sfnt_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 10472 bytes
SHA-256: 26ab23dbcbefdfc2403124d8914063a5a6efafad3da83a4c4f212aadb8ab32a8