Malicious PDF — malware analysis report

Static analysis result for SHA-256 927ef36e41010daa…

MALICIOUS

PDF

102.5 KB Created: 2021-03-14 23:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 62806a0d80e45ac2304e3e43f6005bd4 SHA-1: 385e39a4443cf1dfca91ce729e47a2507e662017 SHA-256: 927ef36e41010daae0740cc9ed3dcfe092312d4b1e08a6b007a5706e626b364d
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 0.9994

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://crophysi.ru/wix?keyword=endurance+shackleton%2527s+incredible+voyage+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371261/normal_604204dd585bd.pdfIn PDF document text
    • http://itsamorem.com/93494775748cz306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409607/normal_5ff0dfa066f11.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/gjjdVgh/iron_maiden_legacy_of_the_beast_comic.pdfIn PDF document text
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/4218510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fd5f0cf68fb5.pdfIn PDF document text
    • https://cdn.sqhk.co/pivoledofag/jajatii/e_coli_uti_treatment_antibiotics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411683/normal_5fca9cc843779.pdfIn PDF document text
    • https://cdn.sqhk.co/newupulig/jbjakZZ/nutrition_information_nothing_bundt_cakes_lemon_bundtini.pdfIn PDF document text
    • https://cdn.sqhk.co/lovaxixifew/bhaijAw/devekiluke.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/jiiHthi/idle_town_uke_chords.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/kulipu.pdfIn PDF document text
    • http://silvanozito.online/cm8870_dtmf_decoder_circuit_diagram_datasheetk7lj6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/the_missing_link_zelda_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/cribsheet_book_kindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bc0ada-7385-4a25-bbc4-014348e846ce/oxgord_ms300_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb420bb6-7413-4e97-98b9-35b777440ef6/vomuvofularuwomonogod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2623a5-6171-4936-ad75-fca36aec28a0/a_suitable_boy_review_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/gidonodoseluj.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.gnu.org/licenses/gpl.htmlIn 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
font_00_sfnt_off000120e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 5868 bytes
SHA-256: 5f9ba66ce5f23ba59ca4dba0f37db7abb09e6592882be4f6703c5334594d51c8
font_01_sfnt_off000134eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 5852 bytes
SHA-256: e197c3daed01507d2166f9aa476220777787e91ae28780e40f08fcf4deb9861b
font_02_sfnt_off0001439c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439C 1852 bytes
SHA-256: ab7952e30a868751faa025f2e14b53a51e83c417853e71d0ae878d8a5e8faa15
font_03_sfnt_off00014c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C75 12736 bytes
SHA-256: 5f82364fd37cf863b406b990e1759feda80cbac28e184e002023a690d2d27261
font_04_sfnt_off0001761c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1761C 16064 bytes
SHA-256: e456b5595f6e624407e10960d432782794320480929f7deed69280b081edb597