Malicious PDF — malware analysis report

Static analysis result for SHA-256 26637e9141888729…

MALICIOUS

PDF

109.3 KB Created: 2021-06-11 05:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d9a9fb757866637232b9fbe7417f9ab3 SHA-1: 4364eb68182170ea3dd92c991f4063bfb04af9cc SHA-256: 26637e914188872922ffa07755bf99cd5af44b7e7ea59917d1fb14276e52e25d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nomylo.ru/pbw?utm_term=kids+marathi+story+pdf PDF link annotation
    • https://felaxifuf.weebly.com/uploads/1/3/5/3/135320117/mimudefowepuvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379971/normal_5fe3ecad5f3c1.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/d6e4ee4f3572.pdfIn PDF document text
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/zirobuva.pdfIn PDF document text
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/3217453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5ff0b0ec31555.pdfIn PDF document text
    • https://nukimaxirob.weebly.com/uploads/1/3/0/7/130776041/tatigakiwedo-roketalez-lexakosev-nonit.pdfIn PDF document text
    • https://tajafakedebufu.weebly.com/uploads/1/3/1/4/131438499/roniwogaxu_wolakowinu_bejewo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5fe5e5e3ef259.pdfIn PDF document text
    • https://gelurojaf.weebly.com/uploads/1/3/4/6/134697462/2894833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_60bbedc6857a6.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/dadadalomunij.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/kupagisagajogejub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_601dac1e131fb.pdfIn PDF document text
    • https://kuwuxegizeduki.weebly.com/uploads/1/3/2/6/132695805/9790075.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
    • http://fedorahosted.org/lohitIn PDF document text
    • http://xibosini.pbworks.com/f/nuzunut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57403b43-69da-44ad-b2c7-fa9ab04e5f71/auto_clicker_for_chromebook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431127fe-6d23-4785-9958-e5a6e22f0af7/nisenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a2d981-5b14-468d-98a6-346a710dd1aa/lanokikosukuto.pdfIn PDF document text
    • http://kiwuwas.pbworks.com/f/sentence_structure_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/365ec3eb-58fc-45d0-b7bb-df7880b2782b/dowomifegikivaburi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da6d9b8-bb86-46f6-932f-b3e7de5823a9/building_construction_illustrated_ebook_free_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 4980 bytes
SHA-256: 1ff0fe041df73c102dac2d0d0bbafe01cde06f760418a61355a9bdfc8d7fe2f1
font_01_sfnt_off00013c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4D 4884 bytes
SHA-256: f7687cca7e9e5bb9cf477d378a6f7c3280f588a900e4f635e71d81959faf5125
font_02_sfnt_off00014cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEC 11696 bytes
SHA-256: a212af7f0b4ecac376e9adc6d7ebe9449514ad1671e2d5b20cbe54d0db7af6e5
font_03_sfnt_off000173c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C2 16096 bytes
SHA-256: 2dff1fc3e5bf1049a512ca2ab3d4448021a5e4676c0c9a63fbc3d390c83797d9
font_04_sfnt_off00018889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18889 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
font_05_sfnt_off00019689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19689 4376 bytes
SHA-256: 1bf987be48d14e47ec7de6799587aa99c0968ae0164feb8d2ba5cb071bb88ef6

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