Malicious PDF — malware analysis report

Static analysis result for SHA-256 da16bc885163ffab…

MALICIOUS

PDF

78.6 KB Created: 2021-03-31 02:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c997f5dcee3ac5dd1a01f75018ca1aef SHA-1: 89e6da6ab98f926b957d5e48562f5271078c985a SHA-256: da16bc885163ffabd31e9380d71bae66a21a00cea57a946aba645e3b56f332e3
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 pointing to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/award?keyword=advocates+remuneration+order+kenya+pdf PDF link annotation
    • http://fitatuvepejozo.sportsontheweb.net/best_entrepreneur_books_of_all_time.pdfIn PDF document text
    • https://jekodijup.weebly.com/uploads/1/3/4/4/134490718/31f1d4.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/14910617375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_60497d1188b95.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/K9gghja/irancell_gp-_2101_td-_lte_modem.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/gghgijg/adidas_yeezy_700_v3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_6052696f433f6.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/duraperoneturuve.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/heeajfI/lego_hidden_side_app_tablet.pdfIn PDF document text
    • https://zefakibafiv.weebly.com/uploads/1/3/1/3/131383453/6d0050ab0.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/jobafokizedezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_605f84321a9d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_60140ba3a50ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fed214cf371f.pdfIn PDF document text
    • https://niravewowinud.weebly.com/uploads/1/3/5/3/135343761/8897759.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/jhMgYNm/bubble_sort_legend_level_36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_605bb227d40e3.pdfIn PDF document text
    • https://begiruxuvasepi.weebly.com/uploads/1/3/5/3/135351124/xetoxubuxul.pdfIn PDF document text
    • https://cdn.sqhk.co/soxemudu/lidiajf/dope_wallpaper_hd_1080p.pdfIn PDF document text
    • http://sirunome.mypressonline.com/words_their_way_syllables_and_affixes_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_605bfb46333fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414172/normal_5ff041e10abec.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://lamupimifuban.onlinewebshop.net/10387636719.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
stream_003_off0000fb47.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB47 10352 bytes
SHA-256: 6ba169072c545fb29d7edf2873f93ff983d80df5613b102728e954c87b566ecf
font_00_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 5368 bytes
SHA-256: eed633876e975524c9c1cc7c70ed59baca85d3c3f83738720120b7d773cd8c7b
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3