Malicious PDF — malware analysis report

Static analysis result for SHA-256 5875306fd10cb9aa…

MALICIOUS

PDF

74.0 KB Created: 2020-12-27 07:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 14c3550194d7ea2bf76a10d771613bc0 SHA-1: 9ff47c1abd746eac5fda3350fbc3ed51cb2dc2d4 SHA-256: 5875306fd10cb9aa04ee7e69764887ee0b99e3e28b204c50ca4de319eb7ccfcb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple URLs indicate a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm its malicious nature, likely exploiting PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=car+loan+excel+spreadsheet PDF link annotation
    • https://cdn.sqhk.co/dozirolizilu/hicmMhc/feudalism_pyramid_hierarchy.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/9596081.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/f68cbc245d207a.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/fovubukoduved-mekur-vasazilivapuxok-bavukatajimoje.pdfIn PDF document text
    • https://tafevivif.weebly.com/uploads/1/3/2/6/132682704/kusujazi.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/jb7hghd/41394817915.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/bhdjgwv/escape_room_zombie_nyc.pdfIn PDF document text
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/5204602.pdfIn PDF document text
    • https://falerelijiwega.weebly.com/uploads/1/3/4/6/134612416/mevonodi-xisugiwop-galesujuzelomum-gogiku.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/jhhiheR/yeni_turkce_pop_en_hit_100_muzik_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/champak_comic_book_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682fc3ff-95fa-4172-acd4-6ad7332463a5/sample_letter_of_no_medical_records_found.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_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 5136 bytes
SHA-256: 51fce7c27de91174166f4f2f54ac97b3c45a0675f2dfba8fec78e21b0f3eb1f3
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 10984 bytes
SHA-256: f6441701529eaa89fbb841ab0cf731eb6b4793d68ad4471cccc5c1ab64f02a9e

Open this report in the interactive analyzer, or submit your own file for analysis.