Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaef56bee9899c8…

MALICIOUS

PDF

74.6 KB Created: 2021-06-04 03:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0bd84ee55705cf52dd85962777fa1b05 SHA-1: 88b40f40e39d57db0ffab73d4921365c557df3d2 SHA-256: 8aaef56bee9899c83f331074fbb4e78cb3815a3d594e19cd8718bbca93d90a58
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL, https://crewmak.ru/pbw?utm_term=tales+of+a+fourth+grade+nothing+activities+pdf, is presented as a lure for educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=tales+of+a+fourth+grade+nothing+activities+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409797/normal_5fed4684c192b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_603060c2841db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_602474f21f4fb.pdfIn PDF document text
    • https://mimifutugeteze.weebly.com/uploads/1/3/0/8/130874087/490c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_604648be814c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_606b2dc49914a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_601af32b70e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_600fac2882676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_6007e9c3c4bd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5ff0f838c4872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_605574b422ddf.pdfIn PDF document text
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/logovukofumavuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365602/normal_6007362fb3886.pdfIn PDF document text
    • https://luloludelipirad.weebly.com/uploads/1/3/5/3/135318650/2d5eba2f17c6.pdfIn PDF document text
    • https://simisidexibasu.weebly.com/uploads/1/3/4/5/134502995/a559b9ddd.pdfIn PDF document text
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/lidebewof.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://wiwedano.pbworks.com/w/file/fetch/144427869/anthologie_les_fleurs_du_mal_thme.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/how_do_i_retrieve_a_deleted_voice_memo_on_iphone_6.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144415356/nolajakajifo.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/xojipalos.pdfIn PDF document text
    • http://nipekari.pbworks.com/w/file/fetch/144555174/xumisomilekaxoz.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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 5308 bytes
SHA-256: abdecd13726770a76259ba0af215c211a60e6e42eafbd9b59792873957bd7c19
font_01_sfnt_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 10808 bytes
SHA-256: 603e753c7cf121a57257e8cdc3aecb40af3a9471640194c8596ced6c3f293252
font_02_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333