Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35c3936d947fcd6…

MALICIOUS

PDF

81.3 KB Created: 2021-03-16 18:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e0979952eeed6e0f42dea99fdd3fca71 SHA-1: 9a36138c37b1b2fcdbf6886d31cf15a4862f8a21 SHA-256: a35c3936d947fcd698e8b5f51febe87c6095783e240978a8c300d9a319939391
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/strik?utm_term=how+to+make+pvc+shooting+stand PDF link annotation
    • http://nodefiw.medianewsonline.com/jazoxasenagasadoxu.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/kixerajajexobodo.pdfIn PDF document text
    • https://mojurakikaluno.weebly.com/uploads/1/3/1/4/131438245/vuvupedekegenivapuw.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/zupaxut.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/bufipolef.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/kasuf-xakafozivovozij-lukojurisukevon.pdfIn PDF document text
    • https://pukiroxe.weebly.com/uploads/1/3/2/3/132303351/080f039a.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/1d26ac4d708.pdfIn PDF document text
    • https://rasaputale.weebly.com/uploads/1/3/5/3/135323831/fuwexo.pdfIn PDF document text
    • http://bexowobiminefi.mywebcommunity.org/taduzux.pdfIn PDF document text
    • https://sapobukemofox.weebly.com/uploads/1/3/5/9/135974899/wazereze.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/3104728.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://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_ba22a1177104430d832495376a3b34d5.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_cbbc17a726514ac18cc2891921fb2787.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_82376965ee0e4a20bc55081a322f21aa.pdf?index=trueIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/matlab_plot_line_width.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_ce8a57152d2243bbb2779ead35f1bc3c.pdf?index=trueIn PDF document text
    • http://nabafutig.myartsonline.com/is_it_ok_to_eat_brown_rice_on_a_diet.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_0c02d806f8534dcbb6ff2af92b8d55fd.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_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 5324 bytes
SHA-256: 5f02b72d58ef8ac775827be77c8a1814ebd4ab9b66c9dae65affe7f1a6619b61
font_01_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 11232 bytes
SHA-256: db605e66caa2a4aa5694c988cd29d69cbb9a92e457238e5b13056a8b34b9fefe
font_02_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c