Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd64138d10db3935…

MALICIOUS

PDF

79.6 KB Created: 2021-02-07 09:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3c5424bba0f3a9afe6bf5a12d2328dcc SHA-1: 5ca0465aaa58db42595132289d4dd126b6851e0d SHA-256: fd64138d10db3935e2f80fc67710dc66b5cd5fa45aadc809be7cb17191658f18
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that function as a link farm, directing users to download files, with one URL specifically mentioning 'autocad 2010 trial version'. The presence of multiple disposable domains and UTM parameters suggests a campaign to distribute potentially unwanted or malicious software. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/aws?utm_term=autocad+2010+trial+version PDF link annotation
    • http://copyright-notice-ig.com/fobetegelomumowadegutsayt3.pdfIn PDF document text
    • http://baxijemapuzoxu.22web.org/bhakti_sangeet_song_free.pdfIn PDF document text
    • http://dithetsen.xyz/climatizador_consul_c1h08cbana_manualyxjm1.pdfIn PDF document text
    • http://robertferrell.net/el_hip_hop_est_que_arde_pelcula_completa_en_espaolut2b4.pdfIn PDF document text
    • http://wide-take.top/54974477872k1xhk.pdfIn PDF document text
    • https://puriruwuz.weebly.com/uploads/1/3/5/3/135395363/pumono-retiwut.pdfIn PDF document text
    • http://wopivobozas.66ghz.com/formato_a3_toyota_excel_espaol.pdfIn PDF document text
    • http://rewutudot.iblogger.org/bhajan_song_marathi.pdfIn PDF document text
    • http://1eyvgo.xyz/khan_academy_sat_test_10_answers86hx9.pdfIn PDF document text
    • https://mevajivikupewog.weebly.com/uploads/1/3/0/7/130775189/352c579c.pdfIn PDF document text
    • http://unlockdeals.shop/anti-_aircraft_flak_battle_badgebrp27.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://sedejavuguz.rf.gd/guia_para_aprender_ingles_desde_cero.pdfIn PDF document text
    • http://vabopegimunufet.rf.gd/munigapeduduvovi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 3016 bytes
SHA-256: 2e5edb16b3213aac72f044458146fa31432b4de2d099e09bd529977e30638444
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 5188 bytes
SHA-256: 143250673149181656347d7a88d480854de081ad18c0b4e6acafa078dfea867e
font_02_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 11572 bytes
SHA-256: 61f9d82075287ea4891d124bbf1454a9cd0445db0d330f000f2b5c441f343afb
font_03_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176