Malicious PDF — malware analysis report

Static analysis result for SHA-256 8070251192b71f46…

MALICIOUS

PDF

86.3 KB Created: 2021-02-21 17:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8193fe17b7314a098595d8e22f095781 SHA-1: 9a3fc8eb9c99e650c79f5cc39a88cd024cae1cc1 SHA-256: 8070251192b71f46aa8b859598a3a15dbfb5acd3532629a7685820783c64f353
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services and employing UTM parameters, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=bardo+thodol+pdf+gratis PDF link annotation
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/pevizedibigujab_musabelila.pdfIn PDF document text
    • http://strgb2.ru/884753841617yn0r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_60166d6951978.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/sasaderosuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fdb7bd8c83b7.pdfIn PDF document text
    • https://kawuruli.weebly.com/uploads/1/3/0/8/130814241/c83882556410.pdfIn PDF document text
    • https://nimawotamuxagop.weebly.com/uploads/1/3/1/6/131606149/gutuzokelovosub-lixademavi-matalixiso-viniziromomoket.pdfIn PDF document text
    • https://tugunopoxakisif.weebly.com/uploads/1/3/1/3/131398472/2282984.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388818/normal_5fded678533cc.pdfIn PDF document text
    • http://tersq.fun/washington_crossing_the_delaware_painting_analysisacbak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367919/normal_5feb32308c900.pdfIn PDF document text
    • http://tb-films.ru/29961249326hbylb.pdfIn PDF document text
    • http://f1l3download.site/tsx_quarterly_reporting_requirements8d99l.pdfIn PDF document text
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/fapiki.pdfIn PDF document text
    • http://reduslim-sito.site/vumatanezibmho2p.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/simasonirebe.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezebepit/butterfly_fly_away_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/ppf_challan_form_sbi.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/ver_cazadores_de_sombras_ciudad_de_hueso_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/gomimafimukola.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fe25.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFE25 14676 bytes
SHA-256: 3f83e8ecf9fb3fd0f772b4e0f6e08c23b196f595a11f912a7322a29c50e5c1d5
font_00_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 5352 bytes
SHA-256: 7b90384dee1c9ff05b50aed9720b88a60b7aa96769d6e7307385ac5b22dfc63c
font_02_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 10920 bytes
SHA-256: 07023575347f08b275a1ba538f2a088fdba032029b6cd4f6b87a6f099e7cdee3