Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5e4842ae6f6d99…

MALICIOUS

PDF

83.2 KB Created: 2021-06-11 06:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2f389ab94edf5beac478e0ad9ab5ba08 SHA-1: 3dee8ae867a958ffe1cb1a04a98b72d4ae26f0c0 SHA-256: 2a5e4842ae6f6d9977814967af0d852d1326440939df0aa94257f522da891aaf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of 'wkhtmltopdf' in the metadata and the ML classifier's high confidence score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/pbw?utm_term=ripped+in+90+days+the+exact+blueprint+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6057e6a42ceb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_600da21467c0e.pdfIn PDF document text
    • https://sabigakubotel.weebly.com/uploads/1/3/2/7/132740275/1913500.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5fced6007c522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417834/normal_5ff9964fbbbb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_603354d35bec3.pdfIn PDF document text
    • https://xixodojele.weebly.com/uploads/1/3/4/3/134375941/lujolelov.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/tibupobubokade-masusupivube-vubum.pdfIn PDF document text
    • https://pijefezumiw.weebly.com/uploads/1/3/1/3/131379255/nasitodiwaze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dumogaluz.pbworks.com/f/nostradamus_book_tamil_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7450f1fc-b0f4-42af-9655-2544093bd327/vojesadif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91dd1c2-e930-4b0c-84ef-dde5a9ede4cd/clinical_bottom_line_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f697ba-a273-4795-8983-aaac123a5974/sample_cover_letter_for_university_lecturer_position.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f62269-2393-4f62-9b7b-015d560da11b/julemesipepowobojik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2ee4e6-139c-4520-a89e-49a4e2ad4e0d/how_do_you_clean_a_safety_first_cool_mist_humidifier.pdfIn PDF document text
    • http://legesir.pbworks.com/f/2240915954.pdfIn PDF document text
    • http://rukuvekuke.pbworks.com/w/file/fetch/145076775/chal_mera_putt_2_full_movie_todaypk.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/free_online_mp4_to_avi_converter.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144833166/belijegawilepovixon.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/145104762/the_vast_forgotten_realms.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_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 5632 bytes
SHA-256: 64bf373bb01d4e19d76113e25dff4134eb97970fbc91c68185cf518b600624be
font_01_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 10800 bytes
SHA-256: acf78693948f33c24fe37c7006934d3094c444563a863a89296dd9f55f5be626
font_02_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3