Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d66e12d8d10f749…

MALICIOUS

PDF

71.1 KB Created: 2021-02-04 08:09:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8f8267b24a84ba19db806923ec7a2192 SHA-1: 3449c9f691321e3af30a3c57938b0e35db585bff SHA-256: 5d66e12d8d10f74911179f9294bae3390a9dc73a9edc397fe07a29bba717d387
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to distribute malicious content or phish users. The presence of multiple disposable hosting domains further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/aws?utm_term=annapurna+base+camp+trek+map+pdf PDF link annotation
    • https://cdn.sqhk.co/patemugimej/ghagcia/rnb_music_mix_2019_mp3_download.pdfIn PDF document text
    • http://proita.space/xidedujifawumi6iqiw.pdfIn PDF document text
    • https://zonulezewuras.weebly.com/uploads/1/3/4/8/134890742/b45150.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/3964206.pdfIn PDF document text
    • https://cdn.sqhk.co/losopodelim/vlc38ib/xerasodupovatatibokalixuz.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/rorujosa.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/wkgjAjg/15951196880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5fe848883fb74.pdfIn PDF document text
    • http://kir.center/waxolewoworamulujoselb1kzc.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/H0jgOih/dynamite_fishing_world_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dinokafoxume/c0Jhegd/jowuboxomob.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/fOmfjak/28158449926.pdfIn PDF document text
    • http://bifitiguz.iblogger.org/yealink_t48s_spec_sheet.pdfIn PDF document text
    • http://afracheat9.xyz/can_tachyons_escape_a_black_holehe605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaxelajifamukas.rf.gd/tikusarenosojorojeka.pdfIn PDF document text
    • http://mujunuge.rf.gd/ice_sheet_ogden_utah.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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 5464 bytes
SHA-256: 51adaed84ffceadc9cd627ff36db1644e5bc956e5eed42b075df1eeea10b0124
font_01_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 10048 bytes
SHA-256: 5fd019362e2740d0c8c338b53d5f9151e3203595bf9c360f7d2470c999b7a0b5

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