Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc61b61644af2c4…

MALICIOUS

PDF

84.6 KB Created: 2021-04-06 07:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f94ac38ce8e830de8b995524a42beb94 SHA-1: 9abbdf85f012d2d718b98f3952f9828c4a213ffe SHA-256: 0dc61b61644af2c4a117255c2e5ccbbdc1de2f3120b70160fab9bdcba7e669e8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to drive traffic or host malicious content. The primary URL, 'https://xajibur.ru/wix?keyword=vocab+workshop+level+b+unit+2+answers', is likely a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan.

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://xajibur.ru/wix?keyword=vocab+workshop+level+b+unit+2+answers PDF link annotation
    • http://wojisub.mypressonline.com/95896710004.pdfIn PDF document text
    • https://befukifesili.weebly.com/uploads/1/3/1/4/131453358/356155.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/ctet._nic._in_answer_key_2020.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/basura_inorganica.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/1a6f993a3d188.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/vb._net_download_file_from_server.pdfIn PDF document text
    • https://tikamujajinug.weebly.com/uploads/1/3/4/4/134467206/3365347.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/649e998a-4767-4a66-b456-8f138265d459/popabekidu.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/gunipalozekokuverupo.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/english_speaking_course_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafa0056-d731-4d3d-816c-6ce64fefa00b/88534593745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59cb60c6-0f16-4163-9e9d-cf0b42590bc6/craftsman_3.0_edger_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1a53c0-1f78-4d79-9fc4-eee2360c561e/foundation_asimov_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be961b27-b521-4d24-9246-f9dd3f0eb8f5/axe_fx_ii_xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce06e8f-83d1-4c5d-b849-571d57780d2b/bimarigumepa.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/vikizifuletak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c067cb08-caa7-4bdd-a3a9-a3f96ab0f263/94506599717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f212b0-f233-4c3d-ac50-e4a36fb1bf55/lepowuzos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02742ce-c574-4043-b097-cfc3118460dc/40915105735.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/vidmate_old_apkpure_apk.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 5476 bytes
SHA-256: 4f7dad96860ed0d1070889e48c635aa26c98d0fec4a315f791ab2812b4711ee9
font_02_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 10892 bytes
SHA-256: 5cffdf0654f2a071aa3358647e3cfa40e6d293416124087d028ac7cbb9d09330
font_03_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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