Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b86fcd0c125133a…

MALICIOUS

PDF

102.0 KB Created: 2021-06-13 01:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 735efcee8ae580547a9fa630fc31fb14 SHA-1: df81041a3b1953405749e064a77d8af9eeea7156 SHA-256: 5b86fcd0c125133ae694a7fd8cd4bc7800e3d39f2a25bdc0e6e6f4e7b3d0fa61
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to redirect users to malicious content. The PDF_SEO_LINK_FARM heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/pbw?utm_term=shiv+ji+ke+pure+naam PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446394/normal_5fddcbc9591cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454184/normal_604f59c01940e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_602ab2b12ffc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450256/normal_5fe4175a65104.pdfIn PDF document text
    • https://bisimopax.weebly.com/uploads/1/3/0/8/130814127/lezikaronorusoga.pdfIn PDF document text
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/fudajigeg_dofikazetapafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366952/normal_5fcc3880c754c.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/94c81b333e.pdfIn PDF document text
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/kenobomatodo-mobazofija-rojazagenado-gatomoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_60325bf36ea0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_6022c9de6145f.pdfIn PDF document text
    • https://tegikalom.weebly.com/uploads/1/3/0/8/130874380/8983185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_606e7cc7ccba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_6050028c9300d.pdfIn PDF document text
    • https://labafapagitef.weebly.com/uploads/1/3/1/6/131637364/1411577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_602da87d305a4.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/34716131-0751-4a10-bf7d-24464ab82667/72179476929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01bb5433-8ece-4848-ab68-5ee321621c84/how_to_understand_my_t_mobile_bill.pdfIn PDF document text
    • http://buxuxeza.pbworks.com/w/file/fetch/144736437/desviacin_media_para_datos_agrupados_ejercicios_resueltos.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144411621/47208483878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74624406-c5e5-4570-b804-8c36a4822b6e/mobebebarotepetewam.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/145049691/pazutelipimizosasuku.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015c2e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15C2E 15428 bytes
SHA-256: 6aee77ea5f1a020cdb1007b72508733741ad750fce5a8337ac1160e0bdb2bd1c
font_00_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 5152 bytes
SHA-256: 429c789058106a0fa9053c5a5c3fb2449f7d738012e71a39819bd0bc61eca0cf
font_01_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 10152 bytes
SHA-256: 4ad3ab66abf66ef053c416a0e0ed34bd330997d95b616d21dbfdae12c055e3c3
font_03_sfnt_off000146dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DC 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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