Malicious PDF — malware analysis report

Static analysis result for SHA-256 e734c6303d61b372…

MALICIOUS

PDF

75.2 KB Created: 2021-02-22 13:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e49cc4990bd690b8afba69a992a13eda SHA-1: 52724fa878005fb06eb8b23e3df0107fbff18d59 SHA-256: e734c6303d61b37270c6772ea382f6387b36a0f27fb8ee61b9562b0d540b892e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/123?utm_term=a+temporary+matter+theme PDF link annotation
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/kapanujef_zafinarore.pdfIn PDF document text
    • http://wovewor.iblogger.org/92484313105.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/gWgjjjX/99989031174.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/2gfJiaF/8618314657.pdfIn PDF document text
    • http://fimewot.xyz/the_legend_of_zelda_ocarina_of_time_3ds_rom_espaol_descargareb2id.pdfIn PDF document text
    • https://paxavolufogese.weebly.com/uploads/1/3/4/6/134600391/siregawobafinufego.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/OhgJWQv/cover_orange_players_pack_3_y8.pdfIn PDF document text
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/wesip-tubur.pdfIn PDF document text
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/5703166.pdfIn PDF document text
    • http://arm-watch1.club/rockyou._txt._bz2_freehjx62.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/ayN3hjA/dachshund_dog_price_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/Gjijbhi/greatest_hits_90s_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/vefobinibe/KjjY21F/megamunden_tattoo_coloring_book.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/oiijhdw/world_adventures_login.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/igMMhfv/98514999545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gasikogo.rf.gd/70423171674.pdfIn PDF document text
    • http://tukorokibenej.epizy.com/hortonworks_ambari_2._6.pdfIn PDF document text
    • http://pikididubemet.epizy.com/96485295770.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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 4940 bytes
SHA-256: 646383e20719826407d60506e26b3d994fb851fbb5dfb7dae8c3f564d3c2158f
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 10876 bytes
SHA-256: cba7b0456e746bf583cc77937b4acf72fc8e760c5de1fdadb3db991a94f3821a

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