Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b3d999dea43e01…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 03:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 927ea55099d55c69802346b7baaec028 SHA-1: da0d919491b761086aa9c7cd7f03a41dc5618a1b SHA-256: f1b3d999dea43e011d7ca85a2309c6d8856c8be7b3dc7222d0ab67de46f82d22
196 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is part of an advance-fee scam, specifically mentioning lottery or parcel delivery lures. It also contains numerous external links, one of which is identified as a potential SEO link farm. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://seumenha.ru/wix?keyword=oracion+a+la+santa+cruz+de+tenerife
    • https://cdn.sqhk.co/sixitigoxeto/ijhjRhe/zodiac_signs_facts_leo.pdf
    • https://cdn.sqhk.co/lewulula/fjer64E/smart_youtube_tv_apk_download_new_version.pdf
    • https://cdn.sqhk.co/bikegola/jafplgd/smart_scan_scanner.pdf
    • https://cdn.sqhk.co/veletafi/gieNjhK/45729298632.pdf
    • https://cdn.sqhk.co/pemoxeriko/AhhbS0s/hard_rock_music_bands_list.pdf
    • https://cdn.sqhk.co/vivutazawi/ggdIhjS/pixelmon_mod_apk_download_for_android.pdf
    • https://cdn.sqhk.co/vamosopon/j9hcjfD/goluwuroreremogexakik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jafojib.rf.gd/apx_6000_radio_manual.pdf
    • https://uploads.strikinglycdn.com/files/0d56fee5-d415-479d-b325-bef905210335/an_invitation_to_health_19th_edition_free.pdf
    • https://uploads.strikinglycdn.com/files/a0bc7e52-f70f-4170-b52f-5282a4b61098/8808798764.pdf
    • http://vasigitosiwow.epizy.com/fundamentals_of_drawing_portraits.pdf
    • http://ziriboxemo.epizy.com/weluvenebufani.pdf
    • https://s3.amazonaws.com/vanatul/45665236115.pdf
    • https://s3.amazonaws.com/wujafivabipo/angela_carter_bloody_chamber_analysis.pdf
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_3d13829576dc46b1ab0dece438247c44.pdf?index=true
    • https://s3.amazonaws.com/pusori/33792458360.pdf
    • https://uploads.strikinglycdn.com/files/c5bf8135-86cf-4d7c-80d5-3ff06ee4ee95/how_to_reset_the_toner_light_on_a_brother_printer.pdf
    • http://tivibejegidabiw.epizy.com/sample_artist_cv.pdf
    • https://uploads.strikinglycdn.com/files/4730bf7a-e1cb-4d28-923f-78a0fa06f946/kafovojezev.pdf
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_202f03af199f46daa6326dd50bf7a4fc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/634c0159-9d6e-455b-a5b0-41c992b40b36/98966977519.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee86.bin
e419b63edfe9d5bf634e483481e22112ca923c9a7dc28cd4026ce6393324d054		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 5092 bytes
font_01_sfnt_off0000ffe7.bin
e9d0038e0246ca34d9373dfab338a68b89dec35834b7c809189334ee3087f5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 11280 bytes

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