Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf873c68b67ff6b5…

MALICIOUS

PDF

79.2 KB Created: 2021-02-14 13:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04dc1b47ae21b9265d04b3670777573b SHA-1: 5c342c87eae4fa5375d9cfc2b4cf42a436b4e503 SHA-256: bf873c68b67ff6b57cc90b369c78d3d3431e48a4f1c723e09832c2b585da762b
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://bologen.ru/123?utm_term=moto+x3m+2+poki PDF link annotation
    • https://cdn.sqhk.co/nupozifulija/gegfwl6/65282596345.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/gpuY4ji/mujimimepagoretubozasegi.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/kral_kaybederse_kenannzaa7.pdfIn PDF document text
    • http://wineninuxusafu.22web.org/acca_f8_lecture_notes.pdfIn PDF document text
    • http://luminar4-download.xyz/screen_recorder_with_video_recorderudcnn.pdfIn PDF document text
    • https://bimefitovaj.weebly.com/uploads/1/3/1/4/131437299/pijimogufezopekilugu.pdfIn PDF document text
    • http://meetporte.xyz/jojofuzekaxusax77rrp.pdfIn PDF document text
    • http://aviabileti.ru/tajetimefaxapixobarewirutqr9t2.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/bZGjcgg/drive_ahead_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/guzikiku/jEUhIPI/download_aqualife_3d_unlimited_money.pdfIn PDF document text
    • http://prosucre.pro/337346977871g25t.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/nuzebumewew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusugafunerepo.rf.gd/chronometer_android_font.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/xejilijubimibegonuxopuruv.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
font_00_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 2944 bytes
SHA-256: 9a1b5a2132b8e54e66cfd9f18555871e619d0b0678ac6c2645178b4aeaa41eb6
font_01_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 4884 bytes
SHA-256: e7a5378c2e983449cd69fa8937fc8bbd0a85784d57fe58e85c8d7bd1515fac7b
font_02_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 14388 bytes
SHA-256: d1816a654a1a800e5184896f916143285c6ef327c093faf008777bbeeeb16fec

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