Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8c62fa560905e2…

MALICIOUS

PDF

75.8 KB Created: 2021-05-13 22:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 93f6f881911c463ed30bbd42512ee5bc SHA-1: 577940bcd2a1ab9aaf5ac2aab987671111b0bcfc SHA-256: dd8c62fa560905e2b31cfe1efa55c2866f529ed6b5a2fc5d6b8cd0c4b57efa97
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=lazarillo+de+tormes+resumen+tratado+segundo PDF link annotation
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/mefado.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/ligotanedixonet.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdfIn PDF document text
    • https://fagadixiridare.weebly.com/uploads/1/3/5/3/135304990/7232339.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/vepogukebojenutabom.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/tif3Lja/22787579201.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/11208272849.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/Z7Hhjhg/futediro.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/HEjjjgc/evowars_io_mod_menu_apk.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/89745962098.pdfIn PDF document text
    • https://cdn.sqhk.co/jimatoju/hd0O7TA/color_balls_hooda_math.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzevunoxina/bhfgenw/kapebodipefexuwiwatu.pdfIn PDF document text
    • https://mudatikijamowa.weebly.com/uploads/1/3/1/4/131408537/vezazebutuzarikebog.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/pibiwujuvalinumizal.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/3fbf3a.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/ihhhgge/ielts_speaking_part_1_question_and_answer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_b1bf5fc009104f238787e3fe7720c470.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b40d3b8-f757-43b7-87a3-ed567faa77be/wemepidipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cbd9d74-f0e6-4ac3-bbd7-14a8370f4521/how_to_program_charter_remote_to_my_vizio_tv.pdfIn PDF document text
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_ea72157d76e1475e9c0534cbf7ad109a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8db2092-ef0d-4364-ac90-185631c88dfe/58276997116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b11ba8-ec64-4911-b3ce-3a0faf908d45/68911325546.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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 5136 bytes
SHA-256: ed8de0f7d0f9f556ecab5e4c6eeb524c92e6c6e67148ade7b8d6f19126d27d52
font_01_sfnt_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 12296 bytes
SHA-256: 1044ea4b32d9af0edfb110b7efb3dd603e9778b46e46cd0e6495b721cbe7b16b