Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae83d61f4565258f…

MALICIOUS

PDF

84.3 KB Created: 2020-12-22 12:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7176fd548542ebadf37df52a7abf87b2 SHA-1: 2ab003f3eddc5bdf98ec58de405a8919471fb463 SHA-256: ae83d61f4565258f44c93f1f96b0646ccff38f10e46d575c32f6291d1cbe673c
262 Risk Score

Malware Insights

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

This PDF file contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a PDF link farm. The document body, though partially obfuscated, suggests a lure for a modded application download. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/strik?utm_term=idle+war+camp+mod+apk In PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/simimadifos_natukofuduba_lariraxigezige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454306/normal_5fb44773dadc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f96a4db6bb05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_5f9e4a0431162.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403127/normal_5fe0e1542d071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420743/normal_5fb44ea7da4c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_5fa7afb9916e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5fa3864d33ed6.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/sevoga/be_closer_pro_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde879f44058d21a0e474c5/t/5fdf8cccf3f88b619f2288c8/1608486093791/wubegetebelivija.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/votoxunamoroxa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe01210ff074777c98670da/t/5fe0f0fe8d20047e5d01bd54/1608577280090/post_traumatic_epilepsy_guidelines.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 3100 bytes
SHA-256: 89649188109e868b91ca7f78372c1c2cfd3df216139a150c568fc3d08f39f84f
font_01_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 5132 bytes
SHA-256: 3623d0e00e3a6b42329db3d5b9e6ad2cd88cd6524f8de99b0cbec429a201b44d
font_02_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 4056 bytes
SHA-256: 5ee79e9fcb295e764bb719c9220f07d36720484a2ed7d988c7c6dbd2b19d1922
font_03_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 11068 bytes
SHA-256: e1aaccdf584f1e24922ea7003de28af52b8f0a0380f1451f3f8044cd941497ca
font_04_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 16224 bytes
SHA-256: 7a7e0f9cb89785dee93ecfbcc78ef93b5a18a5022886c2d5a0bf15d9412c15a0