Malicious PDF — malware analysis report

Static analysis result for SHA-256 37090f5142c0033d…

MALICIOUS

PDF

78.3 KB Created: 2021-04-19 17:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a1a38203d9d569635dea026bd6af1133 SHA-1: 5c86e43ee9f2f6a05dd856c82961b34aa3ea8d7d SHA-256: 37090f5142c0033d1b1c5224d15f5d2831ad15cc1aefcc3e16d6f6b507dbc78e
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 0.9997

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://jottigo.ru/strik?utm_term=misplaced+prepositional+phrases+quiz PDF link annotation
    • https://cdn.sqhk.co/rijomawonuj/ggl6iaa/darufe.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/02d86bc4.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/1965485.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/food_allergen_training.pdfIn PDF document text
    • https://mofesotuju.weebly.com/uploads/1/3/4/7/134712265/9139555.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/nisodewizogemi.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/d8vYhdG/30072089912.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/tulokeribuvek.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/59424983961.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/0qjfWhj/infectonator_survivors_alpha_cheats.pdfIn PDF document text
    • https://fokikemapusa.weebly.com/uploads/1/3/1/3/131398543/4350843.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/7gisika/19819116585.pdfIn PDF document text
    • http://sisogelodaze.medianewsonline.com/tewefitipipax.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/read_mockingjay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/anatomy_glossary.pdfIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_fb5ef4934dae417a89db95978509520e.pdf?index=trueIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/78781013402.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_27c19fec0c2d4d5c9d065db35b84a398.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_b1ea2e9f217c42c188e9c7f149cc3341.pdf?index=trueIn PDF document text
    • http://fobukisa.rf.gd/in_what_part_of_the_country_does_the_story_take_place.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/lusokujipebusixawo.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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 5344 bytes
SHA-256: 36e09dd256ed1a33d22659d9ff3f06d8f79813bf2d7c6d717271174f65cd27d6
font_01_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 10676 bytes
SHA-256: ac52ac0bf8bb10a74ee3d206da9700628b36b79258b4737cca4ebf9fb8e96d8b

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