Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d4261d4b157661…

MALICIOUS

PDF

72.2 KB Created: 2020-11-11 09:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39452cd4ce3fb16fdd6432b84eae4b96 SHA-1: 18bdac50e3ff7b19d73abe8aac7dd238d072fc63 SHA-256: a7d4261d4b1576613cb4d5138e568f5dfe8f924a90416c49072ee961ee2b2a98
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?keyword=author+s+perspective+worksheet+pdf
    • https://xoretesani.weebly.com/uploads/1/3/4/3/134315313/wobilipaxewesi.pdf
    • https://nadevakijod.weebly.com/uploads/1/3/4/4/134490940/sufewizuporep-gekov.pdf
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f880937c88f1.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/88eac021035.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/xasiravenejomajaxaw.pdf
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/5dacd.pdf
    • https://cdn-cms.f-static.net/uploads/4401994/normal_5f9c6c694f8a7.pdf
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/0f3595.pdf
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/zabajufu-femudana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/begijufadi/96958259414.pdf
    • https://s3.amazonaws.com/wilugugo/25771811238.pdf
    • https://s3.amazonaws.com/fejififimaketo/mugegutev.pdf
    • https://s3.amazonaws.com/mupakijivuruzim/gta_5_game_apk_download_android_phone.pdf
    • https://s3.amazonaws.com/zetare/sepokerewesomavoduwegub.pdf
    • https://s3.amazonaws.com/xanebavifamopez/mizijagifekotilajipaxim.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_off0000dd43.bin
ece98e435bcfb42e4d62f84dc47427ff4cdda9f91e496e7d6cb8aa9a92f0671b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 5208 bytes
font_01_sfnt_off0000ef10.bin
8b0b03449e11adb0c9ac23b3fc0522e4af73ca51b9adc70fe2acfe2e63456e0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 11024 bytes