Malicious PDF — malware analysis report

Static analysis result for SHA-256 37be87f20e387aa8…

MALICIOUS

PDF

73.3 KB Created: 2021-06-14 04:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5726e8cc928c4c5d9e695fbfe8ebfaeb SHA-1: 40f1757167eaa148cdf69f65adab61b5c536b541 SHA-256: 37be87f20e387aa81a17ad0798574e92f654f9744b77b326735ffd58677411a6
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the overall structure point towards a phishing or scam campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/pbw?utm_term=app+to+track+phone+without+them+knowing+free PDF link annotation
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/lipozejapedoxal.pdfIn PDF document text
    • https://rajikaluniker.weebly.com/uploads/1/3/1/3/131383998/2294664.pdfIn PDF document text
    • https://nevozijefase.weebly.com/uploads/1/3/4/7/134748823/f66fd7e26331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388177/normal_5ff681d3ad534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375339/normal_5fe2bc8206d36.pdfIn PDF document text
    • https://tozupefiga.weebly.com/uploads/1/3/4/2/134265365/pobak.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/3605d018a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476150/normal_605be848d0000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_60be34759a0c8.pdfIn PDF document text
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/f5840.pdfIn PDF document text
    • https://lovokavupas.weebly.com/uploads/1/3/0/7/130776776/nifigozavajogi.pdfIn PDF document text
    • https://wojaluzuzuduku.weebly.com/uploads/1/3/7/4/137498881/8583948.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/kelijojepe-rilobatiw-wazosevufuzub-dewajopapeg.pdfIn PDF document text
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/rebifoguroxudu.pdfIn PDF document text
    • https://bigamurutixigi.weebly.com/uploads/1/3/4/4/134481126/900ed982bc2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368762/normal_5ffa814de801d.pdfIn PDF document text
    • https://suxexekara.weebly.com/uploads/1/3/4/6/134635419/zakedemubokagepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lalunanefiw.pbworks.com/w/file/fetch/145271964/puc_1st_year_economics_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52485248-1ade-4d30-9599-baf83d76a16a/diary_of_a_wimpy_kid_the_meltdown_archive.pdfIn PDF document text
    • http://fixonor.pbworks.com/w/file/fetch/145230855/mp4_movie_maharshi.pdfIn PDF document text
    • http://jananevava.pbworks.com/f/gazulisuramawadibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52f2a9f-6efd-4eec-b0e1-eb31889a8956/2999360803.pdfIn PDF document text
    • http://goxeguj.pbworks.com/w/file/fetch/145196820/free_cdr_to_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52406197-0945-4108-8881-1e4758b9deae/what_are_the_44_phonetic_sounds.pdfIn PDF document text
    • http://wotesova.pbworks.com/f/pokemon_ultra_shiny_gold_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_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 5364 bytes
SHA-256: d33cd4e30e67d022a560a1ed7a540246b910ba81fba6263aae1fcac828d09d8f
font_01_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10924 bytes
SHA-256: 80f817cda82517729b4e7097991a5745dc22ff5b2200428050a7bf7f17b97d29