Malicious PDF — malware analysis report

Static analysis result for SHA-256 4760f58b686c3597…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 18:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bed539162fb1ec37faf18c92bfb7f749 SHA-1: c5cdf0a39c9594a0260227797807d546bd06db94 SHA-256: 4760f58b686c3597d785086c925bfd8662c9fbefbe2c371843147234f1739ed5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs and the document's structure point towards an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/strik?utm_term=conversi%25C3%25B3n+de+pulgadas+a+centimetros+formula PDF link annotation
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/e16ca3f3363b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5ff5943d66146.pdfIn PDF document text
    • https://tatemisi.weebly.com/uploads/1/3/4/5/134596356/756554.pdfIn PDF document text
    • https://gemaxapofa.weebly.com/uploads/1/3/2/6/132681544/gibasulibemiko.pdfIn PDF document text
    • https://gisogademumes.weebly.com/uploads/1/3/1/3/131379615/b2dcaf78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_602d44939b84d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_6045e89d0bfeb.pdfIn PDF document text
    • https://gazasajud.weebly.com/uploads/1/3/4/8/134879445/2161541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5fe7c8368423d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_601b45896b3c3.pdfIn PDF document text
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/fijununazikamu-katewen.pdfIn PDF document text
    • https://wafewukim.weebly.com/uploads/1/3/5/3/135399971/0ab38.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/e4024743.pdfIn PDF document text
    • https://sasopezanureje.weebly.com/uploads/1/3/4/6/134691995/d4003eabd.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/b3b1f4e8-85bc-4411-8db3-0507f9a28428/14545869313.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/cldr_earnings_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ecb29c-973c-4c71-af52-5257a1dd7472/quick__hot_ah-780_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac99bd7-37dd-476f-a5ed-d9492dd13208/letter_of_interest_board_of_directors_example.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/cyanogenmod_13_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e5a70d-8372-4850-93e9-04b084901805/who_introduced_the_bible_in_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/free_guided_meditation_app_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/sopop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ae8b81-b386-49ec-8fd7-058335b3dae5/fozopupuluxofalaporasev.pdfIn PDF document text
    • http://memaded.epizy.com/vatagupudigugesap.pdfIn PDF document text
    • http://tadufaz.rf.gd/welagasizob.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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 5576 bytes
SHA-256: e47426c84977680393409ce8eccd806a47eafa837f3e732d0ae47333e04af59e
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 12416 bytes
SHA-256: a8260b2557b60c81857693c3787725d71f4518c7095c87225349fdf1acc2619f