Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e0470f5333f61e…

MALICIOUS

PDF

73.4 KB Created: 2021-03-16 21:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd88314ce07b897c942ee1325b2cc167 SHA-1: aedcc6ff330adac552426a53bedb193f74070d6c SHA-256: 25e0470f5333f61e493280980f65b764223635f5a2031f4f28b120b6f5097c21
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm or SEO poisoning attempt. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=st+joseph+wapakoneta+bulletin
    • https://cdn.sqhk.co/supopareso/Ojihege/easy_ways_to_teach_your_child_math.pdf
    • https://cdn.sqhk.co/jipogidara/jjAYpdd/37063380985.pdf
    • https://cdn-cms.f-static.net/uploads/4382201/normal_60174fa925c31.pdf
    • https://cdn.sqhk.co/feluxolid/hJ6jgid/29031174645.pdf
    • https://cdn-cms.f-static.net/uploads/4443810/normal_60280d5b6e2e3.pdf
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/5e292cd8.pdf
    • https://cdn.sqhk.co/jutafegobexe/Pjhbhdz/lexazulibakimota.pdf
    • https://cdn.sqhk.co/xozifejor/inOBWhg/eye_color_change_app_iphone.pdf
    • https://xokewetabido.weebly.com/uploads/1/3/1/8/131857041/jazobedam.pdf
    • https://static.s123-cdn-static.com/uploads/4380540/normal_5feef315f3285.pdf
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5fca3f2090173.pdf
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/leximuxoxazatobava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fenukasoroxido.epizy.com/54781651174.pdf
    • https://uploads.strikinglycdn.com/files/c67868ad-d0b6-4f60-8abc-05e13c3e4469/stock_market_trading_hours_tomorrow.pdf
    • https://uploads.strikinglycdn.com/files/cd9662bb-7192-42d9-91bd-ae37b66e19c4/75063546465.pdf
    • http://suvoxezol.rf.gd/netflix_mod_apk_for_android_tv.pdf
    • http://fuvituze.epizy.com/bhakta_prahlada_tamil_movie_songs.pdf
    • http://jasixerebav.epizy.com/wolevixe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d466.bin
9a3d86db20e1396c57e59e9615f8e3dbe6b883f220b872aa4922145ca3e2436c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 5168 bytes
font_01_sfnt_off0000e5fa.bin
458e59b22fd6b6d6505439b5c2018c9a0866e554ae150ccb300a37734cb3c587		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 10656 bytes
font_02_sfnt_off00010a8a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 4324 bytes

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