Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eeaf2a03ff7e2b2…

MALICIOUS

PDF

88.3 KB Created: 2021-06-11 22:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2985239ae3771c74aef95fc7a879a982 SHA-1: 5413687e0e32f694c207b33510d257a46955b141 SHA-256: 4eeaf2a03ff7e2b29b2f1fd76c6ce526252d0e1644a23d4b8c857c166826ac0e
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text suggesting it is a job application letter, a common lure for phishing. The presence of numerous external URIs, many pointing to disposable hosting and link farms, strongly suggests a redirection to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://philabc.ru/pbw?utm_term=example+job+application+letter+in+english+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366660/normal_602afae5cd31f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388412/normal_5fc78af7d2506.pdfIn PDF document text
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/3687466.pdfIn PDF document text
    • https://zilowefid.weebly.com/uploads/1/3/4/5/134510497/kosezunilebakebuxoru.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4528915/normal_60b31791392c0.pdfIn PDF document text
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/gevedaz_digoxumaj_witefamapuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_600d0140a2570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_6016fdafc995c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413719/normal_5fcda76051b3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460473/normal_5fce7742018cc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379842/normal_60b19f01bdfe2.pdfIn 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/db3d6952-af26-4d8c-9f05-c9295f4d49cc/47243391821.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144518100/what_does_directv_ultimate_package_include.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/how_much_is_a_sheet_of_corrugated_iron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19355019-a1c4-428e-9fe2-ac558b9bdebd/what_is_lokis_rune.pdfIn PDF document text
    • http://wigiwopajuke.pbworks.com/f/6475643372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5010d45a-a133-49e0-8ccc-42b08093cf9b/2066879361.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/145026525/38674015155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130d6cac-2b4b-47a4-8a96-fcb514f877a3/bm_hunter_dps_build.pdfIn PDF document text
    • http://nibenaxibot.pbworks.com/f/2854404955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c7db2b-802d-4e1e-abf9-496f38bfab0c/masebe.pdfIn PDF document text
    • http://divogatupum.pbworks.com/f/splatoon_2_inkling_avatar_creator.pdfIn PDF document text
    • http://kisagew.pbworks.com/w/file/fetch/145078563/35425864277.pdfIn PDF document text
    • http://botinuba.pbworks.com/f/vuwozuxoje.pdfIn PDF document text
    • http://wizepexu.pbworks.com/w/file/fetch/144648915/2389073870.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_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 5812 bytes
SHA-256: 66236fa59454f5008972bfceb1201041f2ebc62fa95873de5e907568a96648ec
font_01_sfnt_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 10880 bytes
SHA-256: bb55a559ad52eef892fccbafcdfe9ec9bd07a19b3462cf01c49ad14084e17918