Malicious PDF — malware analysis report

Static analysis result for SHA-256 365735b3ef8f7e12…

MALICIOUS

PDF

73.8 KB Created: 2021-02-22 14:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2c06485f6277a52de508ed40443eb827 SHA-1: a751acc65f030cc0c193eff2f5e441cc7af1115c SHA-256: 365735b3ef8f7e122e2644f91fd0f6c5cfe063bc54ca18cd8f8a025e24471dc9
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one that appears to be a redirector for a link farm, suggests an attempt to host or link to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'curl_is_always_zeror7s0d.pdf' and a URL suggests the document may attempt to download a second-stage payload using a command-line utility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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
  • 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://baarspo.ru/strik?utm_term=7th+class+english+book+pdf+download PDF link annotation
    • http://1ux.site/hotpoint_aqualtis_dryer_manualkigap.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/alkaline_vegan_diet_food_listxx3tf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_6005bf21f2ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_60141a1a87378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_6019b60aebc2d.pdfIn PDF document text
    • http://reestr.site/91745055028apmd1.pdfIn PDF document text
    • http://krokoboko6.xyz/48819799647o2387.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/41228404252.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487005/normal_6009a77086be0.pdfIn PDF document text
    • http://probnik1313.tech/kms_activator_win_10amc6d.pdfIn PDF document text
    • https://pudakelujoroju.weebly.com/uploads/1/3/0/7/130739680/zumifozi-gakitozepowijek-getabiz-nuwukiwexikakan.pdfIn PDF document text
    • http://bazis-rostov.com/proof_that_the_divergence_of_a_curl_is_always_zeror7s0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_600f5f6013045.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vadibezodaxilez.rf.gd/avengers_endgame_trailer_2_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/dha_multan_challan_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/73711985398.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/71738640969.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 5604 bytes
SHA-256: e81bb416779687e6a56f31f384cbf645d007ffbef7b2abe078fb51e25bb1998c
font_01_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 10784 bytes
SHA-256: aa98910409d9d67def9359cf4edea12db8152b4398f0874989c338aec0087b0c

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