Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec5e80f6feb8247…

MALICIOUS

PDF

74.5 KB Created: 2021-06-09 10:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 34a109aa8628a3ccc945f4c490d6a5ea SHA-1: 21402e3b20dec854b1842eeed028784234128573 SHA-256: bec5e80f6feb8247937be5869def579637c208db7c6dab58890a9589f07d40d1
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to direct users to potentially harmful content or phishing sites. The document's structure and the presence of multiple external URIs strongly indicate a malicious intent to manipulate search engine results or distribute malware via linked resources.

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://philabc.ru/pbw?utm_term=instrumental+analysis+by+skoog+pdf PDF link annotation
    • https://pezibufanijazox.weebly.com/uploads/1/3/4/6/134639202/jafizuragedafi.pdfIn PDF document text
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/33eddfc5572eb3.pdfIn PDF document text
    • https://gapulujazupimes.weebly.com/uploads/1/3/4/7/134775062/f624d.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/lopefijudex.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/sexogorerexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosegawibaso.pbworks.com/w/file/fetch/144506136/30723486313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eeaf199-e3c8-42f5-b179-f3756dd34d66/longest_essay_ever_written.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90481071-4f1b-444f-b9a8-a6d1e6a3baa5/78963077706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5551a59a-6273-4343-916b-839c102ea56f/jojobisapusotima.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/f/myeconlab_quiz_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34255b4a-3a87-4947-9b89-3f9b6432d0f4/85936030186.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144411414/palabras_agudas_llanas_esdrujulas_ejemplos.pdfIn PDF document text
    • http://pevaludim.pbworks.com/w/file/fetch/144909765/convert_word_doc_to_form.pdfIn PDF document text
    • http://wilimonozak.pbworks.com/f/polyphia_bass_tab.pdfIn PDF document text
    • http://balejuw.pbworks.com/f/meri_shadi_me_jarur_aana_full_hd_movie_online_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc95b818-bc23-442b-9959-db8c031681a8/befeputibuduzafefenotitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fff257-9249-4ec7-801b-09dd0d001b32/powerscore_gmat_reading_comprehension_bible_download.pdfIn PDF document text
    • http://xizisimavi.pbworks.com/f/plants_vs_zombies_2_apk_mod_soles_infinitos_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4c6dcd-4b01-42dc-9218-f8df02d018dd/iso_27002_version_2013_free_download.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_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 5604 bytes
SHA-256: 14800ca779335c812115497d1cd2a04b5553ee0c5ffc29cf70129edab00acea5
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 10584 bytes
SHA-256: 766b90009b5f0a75d8670daf2c2e893048c10112165253c05c2d8119ae19089d