Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63bcbefdbd4e79f…

MALICIOUS

PDF

79.5 KB Created: 2021-06-09 12:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 97f0b9757095dfae67166a4b6276e0d5 SHA-1: 5281cadf6be5f2c8897985c8026890520ad021ea SHA-256: a63bcbefdbd4e79f89dd108654a26d6b9cbd8475568ff96e3906f135aa781cdb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded content, though obfuscated, appears to be a lure for a homework answer key, which is a common tactic for phishing or malware delivery.

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://crewmak.ru/pbw?utm_term=lesson+6+homework+practice+multiply+fractions+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469350/normal_6034446d5a5eb.pdfIn PDF document text
    • https://ginimowawogob.weebly.com/uploads/1/3/4/7/134753870/0cd6169ecacc1.pdfIn PDF document text
    • https://gazonuzurixe.weebly.com/uploads/1/3/4/4/134485976/5c0f1eeb62.pdfIn PDF document text
    • https://bidiguregila.weebly.com/uploads/1/3/4/7/134700143/jagamurona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473902/normal_5ff15a188add3.pdfIn PDF document text
    • https://wazivako.weebly.com/uploads/1/3/0/9/130969042/1876958.pdfIn PDF document text
    • https://fusutazewemeben.weebly.com/uploads/1/3/5/9/135976358/nivitakewenisur.pdfIn PDF document text
    • https://jubabanijawema.weebly.com/uploads/1/3/1/0/131070146/fd4fd3c8.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/dab2b7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_600ed8478410f.pdfIn PDF document text
    • https://wimuwiberajiwas.weebly.com/uploads/1/3/5/9/135965043/rajezaxepevubima.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/2eece0d2-ec6e-48ed-bf29-460a100a40d9/kaththi_tamil_movie_download_isaimini.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144550815/piruwafef.pdfIn PDF document text
    • http://dokajawema.pbworks.com/w/file/fetch/144757659/why_is_my_samsung_tablet_e_not_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9c8448-3ef0-4b08-a8af-2d9daf98fbc1/les_jours_les_mois_les_saisons.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/w/file/fetch/144588216/butisadir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33088f8f-1c69-4d1e-b420-97825f577423/kugeruzupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b936f555-8e55-4296-a38f-003ca8d7d6e7/how_to_set_timing_on_94_s10_4.3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3344dc78-cfcc-48c5-8bf3-30b4c821fc59/what_is_slam_poetry_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0394b9d-9c67-40cd-b0e3-a8f2c4f2cfb1/uniden_bc125at_bearcat_handheld_scanner_reviews.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/limiting_reactant_problems_worksheet_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 5608 bytes
SHA-256: 0f0751e88d71994a5553d5fd08c31ab98a6abec3246890f05d69fa6d44ea920f
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 10780 bytes
SHA-256: a3664f7048760788cef728c76e95fc6afc0adb811805d3d8b7bcc3e83525dacb
font_02_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

Open this report in the interactive analyzer, or submit your own file for analysis.