Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef14d3fb7ca16b63…

MALICIOUS

PDF

74.7 KB Created: 2021-03-28 19:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ec1f57915d9d2a7703d4f5ed3246ab4 SHA-1: 74d773bb0f42d240430f769d82e7a1a3723cd243 SHA-256: ef14d3fb7ca16b631a0921b0a92ba0d4e51067670975bc252163dea5d2efb609
96 Risk Score

Malware Insights

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

The PDF document contains a lure related to resetting a Zmodo WiFi camera, directing users to an external URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents, suggesting a potential phishing or content-scraping operation. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://seumenha.ru/strik?utm_term=how+do+i+reset+my+zmodo+wifi+camera
    • https://cdn.sqhk.co/jimumakevaji/ngjRicp/2019_can_am_defender_hd10_for_sale.pdf
    • https://cdn.sqhk.co/xavipinav/gkjiPib/likee_video_downloader_without_watermark_online.pdf
    • https://cdn.sqhk.co/vulovosovem/0gioggh/viridian_green_acrylic_paint.pdf
    • http://gifavojam.scienceontheweb.net/98799210802.pdf
    • https://cdn.sqhk.co/fuvonazavo/gfGhabT/49087315036.pdf
    • http://sijiwepi.mypressonline.com/46370349894.pdf
    • https://cdn.sqhk.co/fiporalisu/djiNhjQ/repefiji.pdf
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/6252395.pdf
    • http://jupizuginilumop.22web.org/38812685857.pdf
    • https://cdn.sqhk.co/koxopumo/xhg3hey/48302153485.pdf
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/rojubesijuwenaki.pdf
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/jadosofurisuri.pdf
    • https://cdn.sqhk.co/bebubofawa/igGGBhf/gravity_jump_place_near_me.pdf
    • https://cdn.sqhk.co/gogojelawov/iaVjiRS/66158693813.pdf
    • https://cdn.sqhk.co/xawobovuji/V2giidp/56523906876.pdf
    • https://cdn.sqhk.co/vasozaponem/id6ngvr/dudedopulitedilozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rupesujutiwu.myartsonline.com/furikol.pdf
    • http://zorogeloma.epizy.com/jajuvawakalisiviraduxonu.pdf
    • http://lorolosog.epizy.com/88741704800.pdf
    • http://mukovixajetunex.epizy.com/rotoxi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d8.bin
7e551c6c996367c1791a3d9180a570f0de6f8f8ece369bc932e21436c20769a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 5340 bytes
font_01_sfnt_off0000f60a.bin
479715b3cf115f7e1704c0eaead87c126d82ce7bbc404d3f1748abdc619b9cfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 11208 bytes