Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6bfdf3c32ac745…

MALICIOUS

PDF

76.9 KB Created: 2021-04-04 06:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b70494709f15817d0093867fa643b864 SHA-1: eaa8173b73d2322967bf87995d924d6e715c309e SHA-256: be6bfdf3c32ac745d4332d84e0f2bdd0d7d3d121c7f42db78cbc5611ca54927a
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to "acrostiche d amour pdf" and generated by wkhtmltopdf, a tool often used to create SEO spam or phishing pages. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5306

Heuristics 5

  • 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
  • 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://midufefew.ru/award?keyword=acrostiche+d+amour+pdf PDF link annotation
    • https://wojamoze.weebly.com/uploads/1/3/4/4/134479738/73629.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/1001_arabian_nights_stories.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/26454102435.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/3_letter_airport_codes_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/gFAXjjj/the_triplets_of_belleville_netflix.pdfIn PDF document text
    • http://wusumomijo.medianewsonline.com/77790295347.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/6646320.pdfIn PDF document text
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/gadawagebizowo_jukotaduvoded_xolexeparew_vubilikovegi.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/princeton_review_sat_subject_test_physics.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/djf1FE9/fun_race_3d_mod_apk.pdfIn PDF document text
    • http://gavolav.mywebcommunity.org/canonization_of_the_bible.pdfIn PDF document text
    • https://jaxemojemilela.weebly.com/uploads/1/3/4/6/134622921/lurumezafi.pdfIn PDF document text
    • https://cdn.sqhk.co/bogebumemilo/NqCDTgg/50974130757.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/dusipunasobo.pdfIn PDF document text
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/vodosezup_galos_wolosavumodox_gaxew.pdfIn PDF document text
    • https://rixulajo.weebly.com/uploads/1/3/4/5/134585814/tivotivufedefijutuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumepenitujox.atwebpages.com/xavivokuzi.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/72938026532.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 5352 bytes
SHA-256: 9b76aa72a0728e8ab6cca759d74e9b3163e309fbb41d190416035e41d96754a8
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 12584 bytes
SHA-256: 53d9e7e1533f44f8220f7f28862104b25638dc88c9b61136d0da0d5485f6c637
font_02_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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