Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14690785e24b88f…

MALICIOUS

PDF

83.9 KB Created: 2021-01-27 10:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cec9488a63542012be743edc9ecc8e71 SHA-1: 96912734d1c6786d91744bead06ff1fc8f007825 SHA-256: d14690785e24b88ffa7f79233b0cc97252dc7214cae8cdab490e06980efca709
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF that impersonates Microsoft, a common tactic for credential phishing. It contains numerous external links, with one specifically identified as a brand-impersonation credential phishing lure pointing to a redirector. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rekoxexegatetun.weebly.com/uploads/1/3/1/4/131452740/rijumumizuj.pdf.
  • 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://druttle.ru/123?utm_term=is+roadrunner+email+down PDF link annotation
    • https://cdn.sqhk.co/wavefekus/h0T1him/56195583688.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/bjbjfgc/jipurin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365542/normal_5ff3099867fc6.pdfIn PDF document text
    • https://rekoxexegatetun.weebly.com/uploads/1/3/1/4/131452740/rijumumizuj.pdfIn PDF document text
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/wudadesomumote-sisunifurugibop-tufaxogaki.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/htgiRPd/neon_cannon_impossible_games.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/nalenowiziwaxe-suwavoxene-mudexiraxuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ff4faa17b78d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465930/normal_5ff50ad723021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_5fd39480411bf.pdfIn PDF document text
    • https://cdn.sqhk.co/gojikanemiju/jdhdc5N/new_cartoon_movies_2018_full_movie_english.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/7xGxgg6/17562239165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451970/normal_5fd0bf717a03f.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/jajijgt/kitateg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420587/normal_5fe21387b7dac.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzujugasije/ZywLjK9/klondike_adventures_game_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366337/normal_6003e81539094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_6006917af2fb5.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
    • https://s3.amazonaws.com/kasuwevovog/air_cadet_uniform_regulations.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/castellanza_formaggi_spa.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/27995787416.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_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 4800 bytes
SHA-256: ab0002b908a32d97599df5094b32bdc1ceef1f6109b783ac502531a4d7951e6a
font_01_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 10716 bytes
SHA-256: d86f6f110bb3b45676bae02837cf49e4ca9264b2f243af9bd79b44efa3f6bf71
font_02_sfnt_off000133e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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