Malicious PDF — malware analysis report

Static analysis result for SHA-256 158ccbe3d248702e…

MALICIOUS

PDF

93.6 KB Created: 2021-03-23 23:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 10d0ec81653a508ba2abe18ca7eef312 SHA-1: 3ea676ed5dca29682776cee78dd532dfda100bca SHA-256: 158ccbe3d248702ecb21f63e31d80396592915388904d89bb21454ba73c0dcb6
192 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm hosted on disposable infrastructure. The presence of a download button lure further supports a malicious intent. The ML classifier strongly flagged this PDF, and ClamAV detected it as Pdf.Phishing.Trojan. The embedded URLs, such as https://yafferge.ru/123?utm_term=10th+standard+maths+book+english+medium+pdf, are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/123?utm_term=10th+standard+maths+book+english+medium+pdf In PDF document text
    • http://dogoderusokita.iblogger.org/76785217897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5ff71821b97e4.pdfIn PDF document text
    • http://firobazotu.sportsontheweb.net/firaxagulotilixitazigomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_5fd7046f8945d.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/why_is_my_samsung_phone_screen_not_working.pdfIn PDF document text
    • http://soul-felt.com/romubewiferogamooggl0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476946/normal_5fd055250b4d1.pdfIn PDF document text
    • http://clobuss.ru/capybara_cheat_sheet0puzg.pdfIn PDF document text
    • http://findssldz.xyz/camscanner_add_free_apkwqu7g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474998/normal_6029e3fb47957.pdfIn PDF document text
    • http://pumba-timon.space/53709110434okyv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_60302c4a8e04d.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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://kubowulurarekij.myartsonline.com/nalunuvoxetisaw.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/la_bibliothcaire_gudule_gratuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8634a0-ac63-4807-b243-f0b93819354a/48165749264.pdfIn PDF document text
    • http://zuzasuzojenox.epizy.com/9338967292.pdfIn PDF document text
    • http://pejagezuwuki.epizy.com/65969184247.pdfIn PDF document text
    • http://bugigumu.epizy.com/3398699153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa375c1-37cf-41c5-9619-dbb275b0d3e8/best_drum_beats_for_beginners.pdfIn PDF document text
    • http://padijajuvon.rf.gd/pcr_full_form_related_to_police.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f1f813-f38f-4181-ae3b-26e0838c9447/resumen_corto_del_libro_un_grito_desesperado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff3290c7-e3b2-4ea0-b720-f31a503f004b/how_to_replace_batteries_on_oral_b_toothbrush.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fc8d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFC8D 8448 bytes
SHA-256: 1806b17ba68e2544d50981832e3143b2858563b9384835d9ec91107c3d7b8d7d
font_00_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 5640 bytes
SHA-256: 788eaa46cb3cdc073e63172260a904221fe446e6a3b38f4c95288b073594779a
font_02_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 10996 bytes
SHA-256: 1e06afa588f61589d3fb6249cd1a73a46f41a9b757e43929e65f41c1f0ef362a
font_03_sfnt_off00013a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A49 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
font_04_sfnt_off00014849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14849 9512 bytes
SHA-256: 90e75159ea3df4079d0976371a88979d4489088c9ea0b028741df7421f19d99d

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