Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7712a32b63cd27d…

MALICIOUS

PDF

82.3 KB Created: 2021-03-14 14:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: efb0b7398a44a7bb7364728dfe6fa343 SHA-1: 5a6bc5950ce120f3d1f4887cd209709de79ffc62 SHA-256: c7712a32b63cd27d4be319cb6311c71999055a279465aff886706c49d24ecf20
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 0.9996

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://botokaw.ru/award?keyword=sonata+pathetique+2nd+movement+pdf PDF link annotation
    • http://ru-1.casa/xivokofokunilunl854x.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/14807576558.pdfIn PDF document text
    • http://mmuuue.space/12145800255kp3g.pdfIn PDF document text
    • http://azakalaza3.xyz/87656363408logwa.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/sharp_objects_trailer_subtitles_english.pdfIn PDF document text
    • http://riragukigud.scienceontheweb.net/astm_a240_15.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/3704703838.pdfIn PDF document text
    • http://sk-anker.ru/books_similar_to_fifty_shades_of_grey_and_bared_to_youkxugx.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/91432912841.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/my_cloud_ex2_ultra_manual.pdfIn PDF document text
    • http://rufowanojona.22web.org/axminster_planer_thicknesser_manual.pdfIn PDF document text
    • http://moymagazin.xyz/bogiteweponunaxor6wet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zuvuzevo.atwebpages.com/samalem.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/rugopig.pdfIn PDF document text
    • http://fawujuvuz.epizy.com/repamunijunilate.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/wijoxemarekodezopapo.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/how_to_earn_brownie_bug_badge.pdfIn PDF document text
    • http://jirabasojexosud.atwebpages.com/why_does_my_upper_back_hurt_when_i_look_up.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/apache_4_score.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/popepexasovevuxiwi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 5280 bytes
SHA-256: 15ed45d2d0ae78f569d61bc58d8fa5f1963d1ce6eb602f0d55574e14fa1fa2e7
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 11156 bytes
SHA-256: a5bf42e2916728c9ea314c6dacefc4b680bfea3247ac614c7dad7a6b0ace8242
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12
font_03_sfnt_off00012d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333