Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea680b5dd62eacff…

MALICIOUS

PDF

80.0 KB Created: 2021-03-25 05:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 833f7d8571256290afd8e307eb0d5f7b SHA-1: 4091af0ada8ea613ac4470f887112e3d95219c29 SHA-256: ea680b5dd62eacfff50b7405ae2863f18b135dc8e6e27ec20e6accf3446fa315
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to drive traffic to potentially malicious sites. The primary URL, 'https://midufefew.ru/aws?utm_term=does+a+home+warranty+cover+furnace+replacement', is presented as a search result, likely to trick users into clicking through to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/aws?utm_term=does+a+home+warranty+cover+furnace+replacement PDF link annotation
    • https://cdn.sqhk.co/vesotadenogo/oDhichi/ms_word_colour_codes.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/xofebisinuwu_nejerupuwega_kiroluzajenim.pdfIn PDF document text
    • https://vegivuben.weebly.com/uploads/1/3/4/6/134660922/5031445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_60323a1763c9a.pdfIn PDF document text
    • https://cdn.sqhk.co/zovifesojeme/heSkDhf/95067677826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_60501aedd5b09.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/IibietO/lock_screen_shortcut_macbook.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/gumuxosakadobuf.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/6360715.pdfIn PDF document text
    • https://vigusukababimer.weebly.com/uploads/1/3/4/8/134881512/boforafobaxejej_teruwab.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/morabo_tunaxapede_rikaje.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/a36ac7fa-b7aa-47bc-af21-cfd197398251/98506688297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36322e3e-e198-4d75-bc7f-412bcc667b9c/tubotasag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7411d735-f7b1-42d4-8931-a568e3db9e6c/lg_refrigerator_not_cooling_lawsuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398633c1-bb38-4405-8977-f12348f6f227/literary_analysis_crime_and_punishment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718d96c5-38a8-4837-a89a-66e1135c71f9/40210138053.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/jesikir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf02e35-11b3-44be-b6be-250fa92ccf20/36717181415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005d4571-a31d-4e5d-9a26-d31de1579975/dasanapikos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fa4c8e-c72f-4476-a596-ec9bc05c85ce/how_to_work_chest_without_using_shoulders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae07369-88be-42e1-aad3-dc3e09e62fe3/how_to_root_kindle_fire_without_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45bba38-d99d-418b-bf17-8ecd294b29f8/toxuputidupusabojadip.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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 5508 bytes
SHA-256: b4ae1722dc519d83f1d7da4c8c9def1f5a5675c50a1db5c0a0c5c182e9de956c
font_01_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 10924 bytes
SHA-256: 8a0798e92badf767d40633f6cfc12b5b588ba0eeb4154d997c847eeab3cb1a58