Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b4898c9e16077e…

MALICIOUS

PDF

75.0 KB Created: 2021-03-21 22:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 692d6a8d1965d7397182b9ebe24f86a4 SHA-1: eb086787c60c64e091f86b4af8cfff9dcd083087 SHA-256: 89b4898c9e16077e71ee04e93bfa827662a20951e33cbb6681f506c9f2811092
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The embedded URL 'https://midufefew.ru/wix?keyword=texto+argumentativo+ejemplo' suggests a lure related to argumentative text examples, likely to direct users to a malicious site. ClamAV detection and ML classification further confirm its malicious nature, pointing towards a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/wix?keyword=texto+argumentativo+ejemplo
    • https://cdn.sqhk.co/padixemugex/gFwjwrZ/try_not_to_laugh_challenge_clean_so_hard.pdf
    • https://cdn.sqhk.co/safajoju/ii2gfQL/webnovel_beauty_and_the_beasts_chapter_115.pdf
    • https://cdn-cms.f-static.net/uploads/4426257/normal_5fd262dc26c4d.pdf
    • https://cdn.sqhk.co/tipekafomube/jgBuib4/sivafifinori.pdf
    • https://cdn-cms.f-static.net/uploads/4489988/normal_601267e5eba9f.pdf
    • https://cdn.sqhk.co/simikitivo/RGkhiY7/mavinedimepilizaze.pdf
    • http://dabiboniner.22web.org/root_android_con_pc_linux.pdf
    • https://static.s123-cdn-static.com/uploads/4489237/normal_5fcf580c1545f.pdf
    • https://luxaxila.weebly.com/uploads/1/3/0/8/130814132/wuvamej.pdf
    • https://cdn-cms.f-static.net/uploads/4383798/normal_604472fd53565.pdf
    • https://vupebuxotilejo.weebly.com/uploads/1/3/0/8/130814562/cdea6454b.pdf
    • https://cdn.sqhk.co/bebuvasipen/Xpvgf85/gang_clash_gift_codes_2019.pdf
    • https://cdn.sqhk.co/jizesusaxeta/Rghggjb/98045899265.pdf
    • https://cdn.sqhk.co/tibidimewako/jajjNvY/94976291542.pdf
    • https://jizetexosobuwek.weebly.com/uploads/1/3/0/7/130740437/sowuzoru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://doledetaxezo.epizy.com/lashing_in_scouts_and_guides.pdf
    • https://s3.amazonaws.com/xufoxorog/hindustani_bhau_status.pdf
    • https://s3.amazonaws.com/zabevog/janapada_geetalu_audio_songs_telugu.pdf
    • https://s3.amazonaws.com/lolijexejomak/77284507471.pdf
    • http://pavasokunise.epizy.com/54514132383.pdf
    • http://kewivawegimomu.epizy.com/human_ecology_journal.pdf
    • http://sovezogodum.rf.gd/rosowoziverij.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_off0000e512.bin
4f69b81f2e6855fda1aea04406939fc779b10ab1a89992dbaf12e10fbe8a8f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 5112 bytes
font_01_sfnt_off0000f675.bin
aa8393736ddf84c0799be278f940cff36af0ba8d89afc7d8843c39bcc42123c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 11964 bytes

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