Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d1828ad3ca72c5…

MALICIOUS

PDF

94.7 KB Created: 2021-02-13 05:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b7061e1d187101aa474083254abe01cd SHA-1: 9553887f7238ef3f53360f46515753a25d67e413 SHA-256: 77d1828ad3ca72c51c6a1a44af8b400619b93290fbf48f4b9e7683bf3e689a08
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://jacksth.ru/wix?keyword=what+do+you+mean+by+desuggestopedia PDF link annotation
    • https://kigekasomek.weebly.com/uploads/1/3/4/5/134598498/6ebdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_600236df8d1cf.pdfIn PDF document text
    • https://bopupuvi.weebly.com/uploads/1/3/1/6/131636777/3736572.pdfIn PDF document text
    • https://runewabelew.weebly.com/uploads/1/3/0/8/130813516/ce26727a645e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386842/normal_5ff02fb0d3b57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_601e00be9c002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_60171c3c86acc.pdfIn PDF document text
    • https://mozufakumijisa.weebly.com/uploads/1/3/5/3/135333945/5194251.pdfIn PDF document text
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/1778089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482625/normal_5fdbfe8939f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_600c003631888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_6023f2e235ed0.pdfIn PDF document text
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/pikuzewe.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/vesufevod_vanagiwo_pegezof.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/3004865.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxododokojuke.epizy.com/66049560893.pdfIn PDF document text
    • http://riwugenesujo.epizy.com/lift_the_flap_questions_and_answers_set.pdfIn PDF document text
    • http://sozidasagekixur.epizy.com/mv_crayon_pop_bar_bar_bar.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_off00013484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 5500 bytes
SHA-256: 0c955055fdc56f5e9d55fbd1fc84003d5adb0371165c333dbc84feb16e86c10e
font_01_sfnt_off00014724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14724 11232 bytes
SHA-256: 6a10bde748b619a63bad8cd0904b394c3234f86b80fc9220a845ad19b3dbc405

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