Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c182e37f1c055dc…

MALICIOUS

PDF

85.3 KB Created: 2021-03-09 00:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 185e8990bcbdd588e6677f4dfea1fe05 SHA-1: 42d503854423bb5b50e6d27199407dc52a449bd7 SHA-256: 9c182e37f1c055dc8a384d88b670be2316e19cf0aca1f0026b10d5e339a280f3
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 of which are on disposable hosting and appear to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to 'free printable simile worksheets middle school'. The presence of numerous external links, including one to 'botokaw.ru', indicates an attempt to drive traffic to potentially malicious or ad-revenue-generating sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=free+printable+simile+worksheets+middle+school PDF link annotation
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/vivatitowamefinu.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/linear_inequalities_worksheet_answers.pdfIn PDF document text
    • https://mumanewuneju.weebly.com/uploads/1/3/2/7/132712109/xedojikal_lezobavotobado_fatufazad_xugerofufejog.pdfIn PDF document text
    • https://tubuzitobez.weebly.com/uploads/1/3/4/1/134108618/kakugupopedukub_dekik_xukupujowax_dulexum.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/23538040573.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/boye_long_loom_set_instructions.pdfIn PDF document text
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/6416581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ropuba/75331820328.pdfIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/resumen_del_libro_la_culpa_es_de_la_vaca_1.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/achilles_tendon_rupture_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e88d4f-27ac-44ee-8621-381ebec2ac38/96570770298.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_4b921364d1774cf0adbbd2cb698b3430.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/disciplines_of_a_godly_man_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcf69a2-19df-4ffb-9b41-e4d6d42f83b0/forex_market_basics.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/apache_hive_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/392566c4-cc03-4371-ae87-9fe6617bb967/nibajizasizonudik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb09c870-83ed-4d0a-b5a4-fc2a07cede08/56950896169.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_37746850c5a84f9693f455a0d6d5a6e4.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_5d512175bc324e15a7fdfca12c8b23eb.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_993dd140bd4d4cc39f8034bffb10bf99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/655ca90f-3013-4c75-be6f-fb19a76b729a/24091069821.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_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 5564 bytes
SHA-256: ce93d5e29cda1812ffb6e4e53e5315e238b98ab062dc2b3a56f668122d2731b6
font_01_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 10660 bytes
SHA-256: a23fc805e05d98995b344772dfc32a34d0d5a83ffb9ce5668492ea4a880ed2f5