Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a49cb9b9eb4107…

MALICIOUS

PDF

74.2 KB Created: 2021-06-14 02:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ef99b8823640f15439fb6024455916fb SHA-1: 64db79ad869645b039e776c0d244639f3a8d2cd0 SHA-256: 05a49cb9b9eb410758874eaca8392e9646ae070ec5aa0bebac7bb79d8f2f92e8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one specific URL is identified as a potential phishing lure. ClamAV and ML classifiers flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://drafthe.ru/pbw?utm_term=dossier+professionnel+concepteur+developpeur+informatique PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486197/normal_5ffba9d26c678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_60224aad7b1b0.pdfIn PDF document text
    • https://mugibutu.weebly.com/uploads/1/3/4/7/134714928/0769145d7a.pdfIn PDF document text
    • https://vozedebilonede.weebly.com/uploads/1/3/5/3/135333302/kajis_tupolokakorit_toziti_xopuboloxiwo.pdfIn PDF document text
    • https://parexuboruz.weebly.com/uploads/1/3/6/0/136089541/d427983c39d0.pdfIn PDF document text
    • https://sesirolomozanu.weebly.com/uploads/1/3/2/7/132741009/modifar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_60593d7c277f3.pdfIn PDF document text
    • https://zukedobawalot.weebly.com/uploads/1/3/4/5/134526307/1660256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_603b8d97dec80.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/f3340daa-541a-4b87-956c-6651d3cd23a7/cryptography_and_network_security_principles_and_practice_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb8ff34-717e-42d5-a1e4-c139c9e20c52/sms-peeper.com_access_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48e94c1-b229-42cf-b384-1664428a55d3/ruger_mini_14_available_calibers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61941284-dbe5-4957-8d35-ad78ced98199/kymco_agility_200_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bced0ff-70ac-49b9-be53-80f9432a645b/9332408318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a95b89-d294-4d2c-9087-4e98bda00943/mekidetime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91289651-fb7a-433c-9159-aca527d81be4/gateboruzoluxorizar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1748f982-8852-4c7a-9f38-a41eec757df2/one_of_us_is_lying_tv_show_pilot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d60f84-1014-4692-99f6-c450b53a1ca6/16412782344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa48479-8c81-46bb-a267-e09beae3eff2/xupugugulisakulor.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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 5484 bytes
SHA-256: 5ec136f2a7a96450a1dbcf9530d79cb319d70fb57da2cab3a65376ce46782399
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 12108 bytes
SHA-256: 65ac8db837686570329fe884e2b366902776d04dbbe38f4278948747ed6b2dc3