Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cad18d9b8ddacc…

MALICIOUS

PDF

73.6 KB Created: 2021-06-04 06:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c0fc553832aa53ffaad4c0a0eb7adfcc SHA-1: 5775408a73b447ddf49d8fce4b14e1c20a89df18 SHA-256: a6cad18d9b8ddacc46f068c5cb69471979b3612153e9589f149117a32175b142
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pixomot.ru/pbw?utm_term=what+is+pollution+for+project PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4487432/normal_60b472d45c809.pdfIn PDF document text
    • https://ribufesoguvas.weebly.com/uploads/1/3/4/6/134680119/23129515626.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/kekelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_6037b748006f8.pdfIn PDF document text
    • https://jasesokotu.weebly.com/uploads/1/3/4/4/134499989/5455467.pdfIn PDF document text
    • https://sazobumegeti.weebly.com/uploads/1/3/1/4/131407647/6c4f4d7.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/4823185.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/lilajexuxuz_tezamoti_jukaguj_mosel.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/zoxubavevujelo_suxusizusatiwa_gufokupadux_sogiluka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33a6f38-0769-4d28-9c79-022ccd7b7973/what_direction_is_the_sun_rising.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939e7bd5-0f47-44ad-a97b-324170156deb/what_is_a_noun_for_class_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73831f89-08fe-4097-a22d-3e2f8d74dc65/how_to_dunkin_donuts_iced_coffee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd14649-8419-4179-9993-e6e6e654186d/rt-ac68u_aimesh_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0877e1f-f6c3-4bb9-90ff-058442b75456/tipurumapoxexanozonimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c7929b5-4998-4490-a42f-a35207620db2/varira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b244ce-10dd-4940-9a4b-3fc2823889d0/how_to_take_a_plural_verb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffefe4f-32b9-4289-994d-635467459f6c/85944460603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69921eef-bdc5-463a-9f15-c6087ff461e3/undoing_yourself_with_energized_meditation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d32354-2556-4791-9bce-ff56d18651cb/is_an_ear_thermometer_more_accurate_than_a_forehead_one.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_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 5192 bytes
SHA-256: 0d592673a0bd1a7181bf1d4a3aa1907eae1932892a00365e3af91e97c6dbd490
font_01_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10396 bytes
SHA-256: b8dbe5448b8836132d699ce88a189bc7ddd4c5903e63b462feb72a1eeb422fa4