Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3db4f4990ee7ed…

MALICIOUS

PDF

73.1 KB Created: 2021-03-07 19:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7e5cf18d3efb56a6ff869cf7b886c2f8 SHA-1: 88883007905619c8dc3ea347a12560dc90542927 SHA-256: 7d3db4f4990ee7ed40b2492496780aa99de37cae7fcc5a17e40f53069baffff7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mezovuduw.ru/award?keyword=c%2523+books+for+beginners+free PDF link annotation
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/8232454.pdfIn PDF document text
    • https://leresawukulet.weebly.com/uploads/1/3/1/3/131384076/7040724.pdfIn PDF document text
    • https://tofudilasikota.weebly.com/uploads/1/3/0/9/130969343/talad.pdfIn PDF document text
    • https://tubidurifubadas.weebly.com/uploads/1/3/4/8/134885002/doluxiponude.pdfIn PDF document text
    • https://fapudunaga.weebly.com/uploads/1/3/0/7/130776769/keveviremibim.pdfIn PDF document text
    • http://fepemewavitik.66ghz.com/bachelard_epistemologia.pdfIn PDF document text
    • https://liwarelavoz.weebly.com/uploads/1/3/5/3/135398493/337580.pdfIn PDF document text
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/1181296.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_29c1af21c1664978b64a1f585eb99a50.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_bba0245669c2458cafd1026d8efa6e13.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_504e5dce111a448aa10f4d7a665ff048.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_9ebce6a696424863a9b9a06764964afa.pdf?index=trueIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_bc96885e6b574c22a6c77d3c5673ab6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/zotajogabaderimezawegi.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/how_to_replace_carburetor_on_ariens_snowblower.pdfIn PDF document text
    • http://novosumagib.epizy.com/kirupajubixidusalu.pdfIn PDF document text
    • http://wemubateba.epizy.com/70706268204.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/isolation_of_aspergillus_niger.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_44abcb5c60cd4c9caae5484b71ef1321.pdf?index=trueIn PDF document text
    • http://japotegalavig.epizy.com/sketchup_8_tutorials_free_download.pdfIn PDF document text
    • http://mezomiwewelebe.epizy.com/vomufifijik.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/online_editor_free_reddit.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_eafe718303e64eaea45232e3ae291bfe.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_6ab4d9caf321400bb6d7479e670bf636.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_031cba0aa84844cd8cf6d773f687cea5.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 3508 bytes
SHA-256: 531e13bae23d9a4cbe21097564e5a70112c34a25d2b399d9890302a330ae5e4f
font_01_sfnt_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 10000 bytes
SHA-256: 3356c0b5ef120012db185efabb80549e4070924b84da850301c3199dff7772f5
font_02_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c