Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5c768d074f7e3b…

MALICIOUS

PDF

79.3 KB Created: 2021-03-09 02:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: df0c1f65368bc3a78834e20655b57e18 SHA-1: bed4cbb135b2b4b529d1fdd86036692c5888617c SHA-256: 9d5c768d074f7e3b7f2a659103e1a98054819d4c784edc19eff22f494644acef
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to obscure the true malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this technique, aiming to trick users into downloading a file disguised as a book.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=blind+man+s+bluff+book+pdf+free+download PDF link annotation
    • http://motorutovibipe.sportsontheweb.net/pivoporurujenagiwet.pdfIn PDF document text
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/94d8f4.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/mopakusukaxube.pdfIn PDF document text
    • http://mozujana.22web.org/lyrics_to_cant_stop_the_feeling_kidz_bop.pdfIn PDF document text
    • http://terem.space/ballad_of_gay_tony_100_mission_guidexv49r.pdfIn PDF document text
    • http://shop-onlain.fun/su_binary_file1q18p.pdfIn PDF document text
    • http://peludofnor.fun/baregabav9v18.pdfIn PDF document text
    • http://mysteps.online/adobe_premiere_pro_2019_free_download_mac53mpv.pdfIn PDF document text
    • http://gubuxuk.scienceontheweb.net/3339742108.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/what_does_developmental_editor_mean.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/nasejagexifisizamikapuzrblr.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
    • https://uploads.strikinglycdn.com/files/52e50604-f57c-491e-86cf-fc39643dac24/ingenuity_baby_swing_replacement_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/brunner_investment_trust_annual_report.pdfIn PDF document text
    • http://zowomazo.epizy.com/61069390601.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/tower_defence_zone_3_mod_apk.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/29368796537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e683bfb9-d5f5-4160-ac2d-f75876e19bcf/20261868862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2417f823-e998-4fbb-9dc1-9681914fc1f3/app_para_aprender_ingles_gratis_ios.pdfIn PDF document text
    • http://fisetefukuwod.rf.gd/wheat_belly_diet_meatloaf_recipe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 5332 bytes
SHA-256: 6f81d3f9b4c9b1ded4c88516460a13d3625f00e40841658f4c07f8df505c9142
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 10644 bytes
SHA-256: f47d78ca5b62d6e4eed1487165fe13b6b0e98d25451029501264e3bf3faa35f9
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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