Malicious PDF — malware analysis report

Static analysis result for SHA-256 4264bbf2cee2cee3…

MALICIOUS

PDF

77.1 KB Created: 2021-03-08 23:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c477bb85fa5ae463e60491d61589fad6 SHA-1: f5f13a4810602127e48d8eeb5702292e660eed19 SHA-256: 4264bbf2cee2cee3b3b763ec966e6063a8361bcd47069c3466e8441c747aad5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for phishing or malware distribution. The presence of external URIs, including 'https://nipisod.ru/123?utm_term=business+case+study+pdf', further supports this, as these are common lures for malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://nipisod.ru/123?utm_term=business+case+study+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408589/normal_6016004516973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fda0b2443f5c.pdfIn PDF document text
    • https://xudapunazegiwav.weebly.com/uploads/1/3/2/7/132741045/rifosupawugirabedajo.pdfIn PDF document text
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/pitaxuxesevowizirol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_602db2c8260c2.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/toxegalabamawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467593/normal_5ff7e76602b20.pdfIn PDF document text
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/795292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387920/normal_6004592ce4a17.pdfIn PDF document text
    • http://rijepesejib.22web.org/nusonira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujatelet.epizy.com/85370222842.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/cambridge_english_dictionary_book.pdfIn PDF document text
    • http://vubulebutaxa.epizy.com/77253167397.pdfIn PDF document text
    • http://dusetelonuzaj.epizy.com/91141124203.pdfIn PDF document text
    • http://ritabodaxitex.epizy.com/bully_dog_gt_tuner_issues.pdfIn PDF document text
    • http://muwadobekele.rf.gd/86544979388.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/how_to_legally_change_your_surname_in_ontario.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/happy_diwali_animated_images_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb3c184-f39a-435a-863a-f2a89aa10f1a/ingersoll_rand_2475f14g_manual.pdfIn PDF document text
    • http://bikemeno.rf.gd/how_do_you_reset_the_ice_maker_on_a_kitchenaid_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47097f6a-9b71-4dbd-a3c7-336cc3574d39/gorek.pdfIn PDF document text
    • http://dujibagakag.epizy.com/14242906507.pdfIn PDF document text
    • http://novosumagib.epizy.com/xefibajowusaxakaf.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_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 5172 bytes
SHA-256: fd7a8359fc2474d5672ce1c29a8327a86b309581114eabc98dc213147ddd921a
font_01_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 10552 bytes
SHA-256: 58fb49905889c574dbd92ef978c3e65e536eb449e5cbe73ce7f3fea5ec46af9d

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