Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77ca766f450ccf8…

MALICIOUS

PDF

72.8 KB Created: 2021-02-24 23:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9765e3953ee1db499c9a63c58d75f06e SHA-1: 7ccd7db5c9b1ac2a8d9da20a4f73f77c6fda5d1b SHA-256: c77ca766f450ccf8b14d590bd1aa9f1eccfb08c8bc7e958e55736521da190536
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://baarspo.ru/wix?keyword=zondervan+atlas+of+the+bible+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502268/normal_6017241b8ef38.pdfIn PDF document text
    • https://lewezuwarekizes.weebly.com/uploads/1/3/4/0/134040914/8418337.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/what_are_two_characteristics_of_figures_in_ancient_egyptian_sculpture.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_60369be02c9b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_600af1fa7b5f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_60092be039b6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_5fe84e36db344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391620/normal_5fe145004c5de.pdfIn PDF document text
    • http://nuzidixiwetor.22web.org/linen_bed_sheets.pdfIn PDF document text
    • http://welifenepural.iblogger.org/certificato_di_conformit_urbanistica_ed_edilizia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455207/normal_601069100949c.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/veg_recipe_of_india_chilli_paneer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fe1a2bceff80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/sony_digital_voice_recorder_icd_px333_icd_px333_digital_voice_recorder.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/crossbill_guides_iceland.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/jugomusowasimeli.pdfIn PDF document text
    • http://jufolijab.rf.gd/will_apple_have_any_black_friday_deals.pdfIn PDF document text
    • http://zumaxupuvu.epizy.com/45452881199.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/dancing_ball_music_mod_apk.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/63002024546.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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 5376 bytes
SHA-256: f03c0055ce093f13de88963deda60b781dd766147163d3a7d9bd4ed4f1dc2eb5
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 10708 bytes
SHA-256: d775a0f64bcc7970a0b812463bca1d3967a68a9a6cf2ae93b7d474fe4067e3a3

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