Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad1a593c13e2964…

MALICIOUS

PDF

77.4 KB Created: 2021-03-15 07:00:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0646dc51edaa334bfe6bca6444a9986b SHA-1: 6b58ed2e1e192fd4a598a2f2de3d2e42a323a01d SHA-256: aad1a593c13e29648d1c8a315bb6271abe59d52fafeebd039c05e7f7d95ee582
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=bitdefender+crack++for+pc PDF link annotation
    • https://cdn.sqhk.co/dinigivo/c1jfgeK/ion_party_rocker_live_speaker.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/jhZrDgh/fireboy_and_watergirl_1_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/hhjticB/long_coffin_nail_designs_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/9ij5kgg/christian_ringtones_for_android_phones.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/ravuxudibure/63204059828.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/capacity_management_information_system.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_8c25600909974c50807b7f4ef9cd5670.pdf?index=trueIn PDF document text
    • http://rusevilo.rf.gd/was_a_body_double_used_in_50_shades_of_grey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4438257e-7140-4f66-9275-b7b4728529a7/dd_3.5_cleric_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7f00ba-ce17-43ce-bb5a-a342e197807c/sorudazudaxetadosufatel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e61631e-560d-4748-8080-ac54e9e1faa4/24777391078.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_91bc3ef4605b4921aa51202eec11b3ba.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_5bc92a5d97cd4ed686427226bf5ebb73.pdf?index=trueIn PDF document text
    • http://fizefitelibulob.epizy.com/zukixotej.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/legikisekonixasobu.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_89ad62d3d7134b248d0f06480b481917.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_420dcc9ba1e948518ea178c00f357ea0.pdf?index=trueIn PDF document text
    • http://foxozokibi.rf.gd/cascanueces_alejandro_dumas.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_4afe09b9d55f479da90273b902a5038b.pdf?index=trueIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_c71957fff3dd4fffbd031e862b0ba6ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac91736-a5f8-4a07-96a2-8c35a0f7cb5d/rosemarys_baby_movie_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/common_app_college_essay_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710754d6-d4c4-4f4d-ac9c-d707bf80e93d/atlanta_nights_of_lights.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_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 5052 bytes
SHA-256: 26aefc2f5fd15500e50edfdacd806ad8f855be7392af54996d12a4732a66ea09
font_01_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 11048 bytes
SHA-256: 0ea5dc88de62b970b91fbf0824def87784da34f7ec57887e49f61839a0ac5efe