Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1bb1f8ba486f43…

MALICIOUS

PDF

74.1 KB Created: 2021-04-08 21:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9686c88d29a32dabd9fec225088f405a SHA-1: b03162a80af26548e863e9e630e5c49d59f88015 SHA-256: bc1bb1f8ba486f430c9437a180880c1770846f2872344590a6965e6df45a61c4
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 0.9996

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://crophysi.ru/strik?utm_term=how+to+install+paint+in+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477367/normal_606542c29737e.pdfIn PDF document text
    • https://nasiposeki.weebly.com/uploads/1/3/4/7/134709897/8638971.pdfIn PDF document text
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/wapije.pdfIn PDF document text
    • http://lnstagramsecurity.net/what_is_a_loop_antenna5n13b.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/pofutorusawemidaw.pdfIn PDF document text
    • http://nesobaka7.xyz/how_to_set_temperature_on_toptech_thermostat2uj25.pdfIn PDF document text
    • http://stassikorskyi.com/el_pollo_loco_sidesrez3y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_604751fb116c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_601149525f76d.pdfIn PDF document text
    • http://gratoramm.website/marut3inmd.pdfIn PDF document text
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/7559716.pdfIn PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/68d7b513.pdfIn PDF document text
    • https://nivuzodix.weebly.com/uploads/1/3/1/4/131410872/netigazedaxafoxewum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5fe75686493c8.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/dosove_gudozujoge.pdfIn PDF document text
    • http://dazenad.iblogger.org/dejar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5fd1020f8cb0a.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/9533bace-c438-405a-abe8-c9de032681ec/4571228361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85de169c-290c-4c35-af29-4200a7441ad2/little_house_on_the_prairie_season_9_episode_10_dailymotion.pdfIn PDF document text
    • http://kutijujivasoda.rf.gd/kevijif.pdfIn PDF document text
    • http://jibogifimot.epizy.com/62998280037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58033446-0da8-4aff-a87b-366ed366c135/56259153952.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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 5104 bytes
SHA-256: 0a564ca8f70dd619a9cfdfe5f4166acb348d24af06799c5a76cf25a0725d7600
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10196 bytes
SHA-256: 55e758f2d773135df95b03ea5de9f9133d3f6efaa922a69a627ffcf9855d1479