Malicious PDF — malware analysis report

Static analysis result for SHA-256 b837e1fff397043d…

MALICIOUS

PDF

66.5 KB Created: 2021-02-09 12:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8ab77eb244eb3e5589bf4ca3a81c61a8 SHA-1: c2ae3ae8beba533cf6f4a750a61587e1cc1c8215 SHA-256: b837e1fff397043d2d975596e63d3f14665dce64de811681d066bda56f438ccd
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, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=hobart+ironman+230+manual PDF link annotation
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/4895405.pdfIn PDF document text
    • https://zesajuletolif.weebly.com/uploads/1/3/0/9/130969916/xesizo_talimewepob_lidagininupit.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/diiABje/marktplaats_belgie_honden.pdfIn PDF document text
    • https://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/kanivoxekitura-geruga.pdfIn PDF document text
    • https://rumarefux.weebly.com/uploads/1/3/1/0/131070750/6618712.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/djcjhfu/98281980506.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/wXkVohh/3d_driving_class_free_download_for_pc.pdfIn PDF document text
    • https://nefufepaxesa.weebly.com/uploads/1/3/1/4/131453268/jewowowoboju_kizezen_tigokubozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_600ded7470c4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489724/normal_5fe4b830816c5.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/sijebelut.pdfIn PDF document text
    • https://kimewazokedusa.weebly.com/uploads/1/3/1/4/131454536/petem-kadutopofowid-karegigaluruda-tixaligani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fd2875c8aafa.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/vamexejosebojivegivo.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/2819014.pdfIn PDF document text
    • https://tebijiburowuwe.weebly.com/uploads/1/3/4/8/134850880/mavenalonanukug-tekozelex-dasudotukojudaw.pdfIn PDF document text
    • https://kafomepavazepa.weebly.com/uploads/1/3/1/4/131409794/8062940.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://disetorabagubed.epizy.com/ropuka.pdfIn PDF document text
    • http://fajegexowesidet.rf.gd/20189421147.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_off0000ba4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4D 4956 bytes
SHA-256: a37b34beb12d95e58cc38aa0fb4051d57de0ed3991cf2344b998e351df360ac8
font_01_sfnt_off0000caf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 9964 bytes
SHA-256: 2a412841aa211d7e2a1f69110a2f8574e224678486e2328cc54e7ebc7e322d1e
font_02_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c