Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5da517e445b80c…

MALICIOUS

PDF

90.9 KB Created: 2021-04-03 14:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc1af0b81fe1fddac2258b242fba3e71 SHA-1: 48d3fe8f2960a2e028f25146b0d6c4c13d7741e3 SHA-256: ce5da517e445b80c24717f7bf96b6eafa75cec708e2ca21908ce8823622bc486
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' designed for SEO. The presence of a 'download button' lure and a critical ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a malicious intent to trick users into downloading further malicious content or phishing for information. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://lozipotod.ru/aws?utm_term=sit+walk+stand+watchman+nee+pdf+free+download
    • https://wotopegajoxife.weebly.com/uploads/1/3/4/0/134042499/beb60f2b640bbf6.pdf
    • https://miroguwitofenev.weebly.com/uploads/1/3/5/9/135958286/4987821.pdf
    • http://babobekoru.66ghz.com/xenofogepasofisivi.pdf
    • https://tusixifowidafoj.weebly.com/uploads/1/3/1/4/131437116/najunanabumizidetin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/resabomibogodaw/17210691234.pdf
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_2f3d5f2bf2b0418491a36356be2c50d6.pdf?index=true
    • https://s3.amazonaws.com/metubevozisul/my_cousin_vinny_watch_online.pdf
    • https://97ca8ee5-9e40-45cc-bd46-7bc1f23d59ff.filesusr.com/ugd/112b0f_29437a315fee4f79b17e5cf6537b976d.pdf?index=true
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_65a4d78dbc55466589c18bdbd7c38567.pdf?index=true
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_b4ff0387e64c4a7db31c8c348152379d.pdf?index=true
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_f380a4761c4d481989003daf4dd0d4b2.pdf?index=true
    • http://lenepozomewu.epizy.com/54006919229.pdf
    • http://newubopuga.epizy.com/mlp_reformed_changeling_oc.pdf
    • https://s3.amazonaws.com/zidosozawok/rirumisapegixuxokiw.pdf
    • http://retobawunabe.rf.gd/90098194304.pdf
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_f110866f65e545d0ba3b237dca59f02e.pdf?index=true
    • https://s3.amazonaws.com/vuraradaso/bittorrent_android_change_location.pdf
    • https://s3.amazonaws.com/xapota/wutawovenowipomex.pdf
    • https://s3.amazonaws.com/somisilegex/21409625217.pdf
    • https://s3.amazonaws.com/moduxanakuri/95824651272.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_off0001240b.bin
257be6bfe40b1001cc9b4424fd7f67249d027a151f35f46e9c753ae3ffb9cad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 5656 bytes
font_01_sfnt_off0001372d.bin
d3a7c293c3f046d9387976a19c964835aa12b49ec1a64f13126eaabbf3c6b196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1372D 11640 bytes

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