Malicious PDF — malware analysis report

Static analysis result for SHA-256 20590f88d6032fe6…

MALICIOUS

PDF

75.1 KB Created: 2021-02-14 12:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b5c9fabe5dcb91b138e908131644f41f SHA-1: 8f68f171718210d9347b02b515e231f0e6c7b6e6 SHA-256: 20590f88d6032fe635f08eb566c224d1e088c95103329ccf51899154fe99b837
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://baarspo.ru/aws?utm_term=treatment+resistant+depression+treatment+guidelines PDF link annotation
    • https://cdn.sqhk.co/zazavoxujub/h0hflvN/vibibiregusoramulifosel.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/jghaghi/smash_city_monster_rampage_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/xFzjbjj/gevamuzujuj.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/h7Hjbja/89623566198.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetoxofaw/jbQYxgg/lazada_12._12_grand_year_end_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/iehfyhg/yandex_disk_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/cshbB4L/archery_target_stand_design.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/Gjd0VYE/63781723109.pdfIn PDF document text
    • http://positarinirib.22web.org/tiduretujir.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/zjelgjo/puwisezopifiz.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/2FzBjaT/dojumizor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pewibim/bajigugaw.pdfIn PDF document text
    • http://momugegunimex.rf.gd/how_do_stratiform_clouds_form.pdfIn PDF document text
    • http://sowutafamewuben.rf.gd/lixuvomapamalelo.pdfIn PDF document text
    • http://wubavon.epizy.com/informal_letter_starting_paragraph.pdfIn PDF document text
    • http://wewabegig.rf.gd/fexojowaxuwemasakogejobel.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/ravujeremuga.pdfIn PDF document text
    • http://tetigod.rf.gd/dusomizeborevatineku.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_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 5228 bytes
SHA-256: 836f8c4ceb28cc91a55d767795aac26eb89d112023f91ce696e20fe9e46ffec7
font_01_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 11024 bytes
SHA-256: 684911cfef364a80efb42f317051ce8cf6dab130adce48ffd492489835a12b82