Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3cb7308b51578c…

MALICIOUS

PDF

76.4 KB Created: 2021-06-03 11:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0984b56f530d958c328c0a2867943da1 SHA-1: 81469e651a567289ed8cd80f5d8a3c11269c7ddd SHA-256: 5e3cb7308b51578ce3de5445d16c52d2dfd572881a8ba8eec31d9f93b51af04c
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 0.9993

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://nomylo.ru/pbw?utm_term=funciones+matematicas+2+eso+pdf PDF link annotation
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/wemopigobabo-tanom-rotiteri.pdfIn PDF document text
    • https://velawavasikene.weebly.com/uploads/1/3/5/4/135400921/jozevotid-gukoxa.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/fanekoxi-gawipopa-liniribovavema-gesugo.pdfIn PDF document text
    • https://nudusomezuriful.weebly.com/uploads/1/3/5/3/135387444/7387523.pdfIn PDF document text
    • https://gifawinap.weebly.com/uploads/1/3/4/3/134386913/3b9a5202f.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/lejokunamugem.pdfIn PDF document text
    • https://gamidamivagug.weebly.com/uploads/1/3/5/3/135324690/mowejinowosu.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/07803949-70cb-4d66-8bfc-40b62a2b4dd8/beowulf_full_text_download.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144418443/lasakaterotumikalujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55ad528-d5eb-47a2-8133-90ddfeaf2d8f/how_do_you_drain_a_maytag_neptune_washer.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/55589154015.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144423375/19863332559.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/96977336044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c7468c-b8c8-4940-b880-d158eebba8ae/bejudefixoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5721b8-add7-457f-9c87-1ce0611bd2b4/laviwuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8dde77-8f12-4aec-ad66-46cce8bed3ad/puxanewekube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c932cd7-3a1b-4f20-ad0e-223bb3369b59/how_do_you_reset_an_oven_after_a_power_outage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab98a6d-d237-4bf5-87ff-f9adc2738e40/gagigusuwukebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e19da5-e96e-4dd2-93a7-99ced1888e33/how_to_pair_garmin_edge_510_with_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e121e8-2d1a-44ec-b889-628a2c36f7b7/alex_rider_review_guardian.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/12259784110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2bf7804-3881-4c99-b14d-dba1e4e744bf/presenting_multiple_regression_results_in_a_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34dc66c8-13b3-419f-ae15-54c8c6f28ea4/72515331913.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_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 5260 bytes
SHA-256: 50063b81866e4650852f215e82caf81df9b2f5114a735862fd9b8254ce57c997
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 11944 bytes
SHA-256: 12d69fbd49d247e3d5f4033b20274962a10fa601437f52c09bf155b4688cd740