Malicious PDF — malware analysis report

Static analysis result for SHA-256 14576fa49cf2ebc0…

MALICIOUS

PDF

80.3 KB Created: 2021-03-15 09:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 60604632db3ecc0c146ec745bb7991db SHA-1: 38d137be0403456d190466f315b429b99ced5825 SHA-256: 14576fa49cf2ebc0d452551dc4fcfcaffd6e12030631c2859bb0e9774939687a
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to suspicious domains and are flagged as part of a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that these links are intended to redirect users to malicious or potentially harmful websites. The ML classifier and ClamAV detection further support the malicious nature of this file, suggesting it is used for phishing or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=words+starting+with+gu In PDF document text
    • http://twitter-center.com/73745891678twgeu.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/cambiar_el_tipo_de_archivo_de_un_audio.pdfIn PDF document text
    • http://libralab.digital/gixadanikanowek0y8l.pdfIn PDF document text
    • https://fewegako.weebly.com/uploads/1/3/1/4/131453302/02876f9e1.pdfIn PDF document text
    • http://autoport76.online/fapufilategigunakibesaijioi.pdfIn PDF document text
    • http://janurikemodowu.iblogger.org/gozamuz.pdfIn PDF document text
    • http://vidclips.design/the_mama_natural_book_review7133z.pdfIn PDF document text
    • http://nikaold.site/breathable_groundsheets_for_tentsp5nyb.pdfIn PDF document text
    • https://minufagotokuwak.weebly.com/uploads/1/3/4/4/134489045/3638933.pdfIn PDF document text
    • http://sabofogetazo.22web.org/genital_herpes_simplex_treatment_guidelines.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/349650de-5b58-45d9-a2ec-b89b082cf037/27396349044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceab5b0b-92dc-4d5c-8c8b-c162ff12b828/xofunerabupipup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef16180-1dbc-4800-a7dc-cdfd8b8d36cd/koviwumemibe.pdfIn PDF document text
    • http://gudazakagozugaj.epizy.com/48609774438.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/53658729151.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/gezujorisenune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c331f14-4b9d-4e08-8b04-b58b89d7beb5/26120342587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b75b27-5afb-49bf-a069-43dbfbe91db4/95509852591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19fad478-7e2c-4726-804b-191b776b7015/rod_stewart_the_great_american_songbook_volume_iv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf05db9b-7fc0-42a4-906a-ca6e36f053f0/41368229851.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/twitter_video_er_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d49054-abc7-4b3d-bb64-f100c82c2c31/getizijipam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d972bd51-8eb2-438b-87aa-3f0297f6419e/62531951583.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_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 5160 bytes
SHA-256: 15f5acae8cb7a130a94a90414b5282b26ec1a09c327f1b8234d657af1d584bbf
font_01_sfnt_off00010f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F56 10916 bytes
SHA-256: d6ac6d1afd8ed121094e4a896ce0a132c5f746f30fbf7d749637bf16072619fc