Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7b2e569ff537ba…

MALICIOUS

PDF

79.0 KB Created: 2021-06-10 14:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 83c884294491a4e962b0230d8d3d2b0d SHA-1: acb16bb5b0f0eed94874541f898037bd8b71080f SHA-256: 8c7b2e569ff537bacfe9471c2e9c9ca94d8c59770f3d5395216ba6d7fbb01213
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic firings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/pbw?utm_term=best+offline+car+racing+games+for+pc PDF link annotation
    • https://zivogozupitis.weebly.com/uploads/1/3/1/4/131406352/nexosuwulog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464053/normal_5fedfe2547333.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/bopozifomog_kivovikewese.pdfIn PDF document text
    • https://fabirakarag.weebly.com/uploads/1/3/2/7/132710689/92bcc0945c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_603b20d84b275.pdfIn PDF document text
    • https://ranuregobaxamig.weebly.com/uploads/1/3/4/8/134889764/voluvenuzuka-zeduko-burug.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/gimulijog_wiruboxabitu_denel.pdfIn PDF document text
    • https://poxemitiwafu.weebly.com/uploads/1/3/1/8/131871555/damutogozuxudow_danusunotalosow_bejepoxavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_5fd7b595c22d4.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/c3446bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_601420adca984.pdfIn PDF document text
    • https://xezojasupaxu.weebly.com/uploads/1/3/4/3/134352535/legup_zudasevigatulem_bofemebob.pdfIn PDF document text
    • https://kuvixirizu.weebly.com/uploads/1/3/0/7/130739951/metigabavolutem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_60274b94c8cb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392860/normal_5fcdd1b6548d6.pdfIn PDF document text
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/2760070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziludezubeju.pbworks.com/f/94972485363.pdfIn PDF document text
    • http://sidotafawe.pbworks.com/w/file/fetch/144757092/wajakebikijaxogevorabed.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/como_convertir_un_archivo_a_excel_gratis_online.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/w/file/fetch/144543609/mopajezovitusinimubagev.pdfIn PDF document text
    • http://fevawigo.pbworks.com/w/file/fetch/144419265/gta_5_download_for_android_apk_and_obb_without_verification.pdfIn PDF document text
    • http://ritijix.pbworks.com/w/file/fetch/144890973/piano_play_and_learn_free_songs_mod_apk.pdfIn PDF document text
    • http://sagabum.pbworks.com/f/b.ed_entrance_exam_2021_syllabus_in_hindi.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/f/20602969483.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_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 5384 bytes
SHA-256: 6795c9ccd96643c6236d30d42c6ae55034358754aa1db22f806ba32b9eb0d49a
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 10748 bytes
SHA-256: c9080e31222e2c00c24b34ac7cefa0efa034efa30e66316542db8c3fe49a9487