Malicious PDF — malware analysis report

Static analysis result for SHA-256 4256f7e6b01dff21…

MALICIOUS

PDF

77.9 KB Created: 2021-06-05 04:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0cb943ec00b12a850ca266cbb360816b SHA-1: dba0b25f1b96da8c0415355a37286023ef232f68 SHA-256: 4256f7e6b01dff21c2de732cb09ea3be2bfee04a573ec963bbe191bd70cc7979
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://zajinet.ru/123?utm_term=bearing+the+unbearable+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/123?utm_term=bearing+the+unbearable+pdf PDF link annotation
    • https://faluwesidiji.weebly.com/uploads/1/3/0/7/130738597/04167443992.pdfIn PDF document text
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/5f51daf.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/jorolofokojibi.pdfIn PDF document text
    • https://pozemake.weebly.com/uploads/1/3/0/7/130776760/6e3c61e38c5caf.pdfIn PDF document text
    • https://buzotifosu.weebly.com/uploads/1/3/2/6/132695554/b283766dd6bb2c.pdfIn PDF document text
    • https://fodewifejala.weebly.com/uploads/1/3/4/4/134491976/069ade62d.pdfIn PDF document text
    • https://kuvitarige.weebly.com/uploads/1/3/4/0/134095916/misar.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/cc1f49e6-dc71-4fd8-bed0-15ceef6472cf/murugudejegufu.pdfIn PDF document text
    • http://biduzoku.pbworks.com/w/file/fetch/144614130/osmosis_gizmo_answer_key_activity_a_continued.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdcced66-c85e-4ed3-9bca-ceae8d3801ff/pevebedulujapemisip.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/duzokefuxidaruzaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5d68f2-5dbf-4bf9-8cf7-cb3eecab4838/gta_san_andreas_cleo_gold_apk_free_download.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/skywars_roblox_gui_script_pastebin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d923ea-d023-4a25-961a-1fe44798cca3/45095176128.pdfIn PDF document text
    • http://veweran.pbworks.com/w/file/fetch/144434595/sudulalajuminosi.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144460986/how_to_speaking_better_english_download.pdfIn PDF document text
    • http://wusagem.pbworks.com/f/paxubepenewopipazemutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f022d0c-a075-4785-82c4-9371cadaa7bc/xanom.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 5312 bytes
SHA-256: 91be29dcec48445213e2414b064a62847e9c12ab20365b78728a7df98cdbc230
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 10964 bytes
SHA-256: d665c4973577e734d0e14cd919767fc5be0365ca56152cfde89d5ac06c4b10d8

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