Malicious PDF — malware analysis report

Static analysis result for SHA-256 da67669e150e0af9…

MALICIOUS

PDF

74.6 KB Created: 2021-04-04 01:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7cd516784460f4890ae281128076b328 SHA-1: 93e625b9f98f895b0bc4bbff188df1f0c12a9d86 SHA-256: da67669e150e0af98f7b756a31a1a5b60cccba01eca040db0bb2a5588fc8db12
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are disguised as search results for common items like printer ink. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=hp+deskjet+2545+ink+cartridge+number PDF link annotation
    • http://womovenum.sportsontheweb.net/canciones_infantiles_ukelele.pdfIn PDF document text
    • http://rajudadude.mygamesonline.org/16674828216.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/252505.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/one_less_bell_to_answer_sheet_music.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/56a72cb9.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/kinusev.pdfIn PDF document text
    • http://pinezotamex.getenjoyment.net/analytical_geometry_grade_12_questions_and_answers.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/guzuzojarijata.pdfIn PDF document text
    • https://vefurubaturuxal.weebly.com/uploads/1/3/0/7/130739777/wilovode-xiraxedokov-fujopet.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/86878503360.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/danulomeropumukiwe.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/wivunonovef/act_practice_test_2016.pdfIn PDF document text
    • http://desovizipelo.onlinewebshop.net/mupenuk.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/mulisawigupeko.pdfIn PDF document text
    • http://mujebik.atwebpages.com/terugilogoxazevaxif.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/online_book_site.pdfIn PDF document text
    • http://vobozezojip.onlinewebshop.net/how_to_disarm_alarm_with_code.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/68696986344.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/gakabogotegewutuzogukuw.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/bichagadu_naa_songs_please.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/grade_sheet_template_for_senior_high_school.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/dixopakixavelotameba.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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 5948 bytes
SHA-256: fa868910292cf00dc604d5ddf98f3156520a7d313e024e584da9647d4c1bd7ba
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 10936 bytes
SHA-256: 6dd35cc6c2e092eb351e9021b4211f6552b6b24130d6612edc667d379e26e7c1

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