Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99b3957590bdc40…

MALICIOUS

PDF

83.9 KB Created: 2021-03-13 21:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21cbb3a34b4b4d89cf7fd100798c5081 SHA-1: 31e2d71875a2080fa658ea1eea21b9c2c1406bfc SHA-256: e99b3957590bdc40afbcecab6262435c89990ec3097bce362a694c5e4cf863db
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan payload. It contains a large number of external links, suggesting a link farm designed to obscure malicious URLs. One of the primary URLs, 'https://ponafet.ru/123?utm_term=rpf+ancillary+notification+pdf', is associated with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=rpf+ancillary+notification+pdf
    • http://torchland.xyz/lokumovavukirenojupawidai8xaf.pdf
    • http://ritixibetono.mygamesonline.org/the_game_rapper_music.pdf
    • http://tarezirok.mypressonline.com/derojafebelew.pdf
    • http://uorott.com/how_to_reference_a_cell_in_excel_vba8g3ic.pdf
    • http://vnatural.space/formation_chamanisme_belgiquec43k3.pdf
    • http://bu-markett.com/audio_technica_at-lp60-bt_skipping7b0fn.pdf
    • http://goldenframecollision.com/25156741498h7kj.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/retefop.pdf
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/6754cd7dad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_d3e21d754b9c4b5996f2fe4e824ede85.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e4df3c5-83cc-4360-9e3b-bd4a9bf20f06/93120519434.pdf
    • http://bememikat.onlinewebshop.net/bipovesesozupawozometoke.pdf
    • https://s3.amazonaws.com/kovezodepugov/tekuwewisutofonimamere.pdf
    • https://uploads.strikinglycdn.com/files/687afa7e-a067-4d3f-b849-2e1996ba6ab8/37768191930.pdf
    • https://uploads.strikinglycdn.com/files/7b3230f2-50d2-464d-b28c-d114744b0c5c/52544842461.pdf
    • https://s3.amazonaws.com/gomakobez/jibabajumekovuz.pdf
    • https://uploads.strikinglycdn.com/files/b7debfb2-8cb7-47e4-b95a-ee8bfbf764fc/kitchenaid_pro_600_series_lift-bowl_stand_mixer_-_6_qt_-_575-watt_-_silver.pdf
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_00e2cc712eb141bbb600e09b5012c9aa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e88035b0-c341-46ff-ac17-f0839bd1d981/46784122434.pdf
    • https://s3.amazonaws.com/xulikamul/academic_performance_rating_scale.pdf
    • https://1096f616-2c68-450f-81f3-3a96b54ba559.filesusr.com/ugd/c34eac_06c79aaaa2b2433aa9973eb08688347e.pdf?index=true
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_a88c7181de5d4300b656dc3eb231baef.pdf?index=true
    • 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_off0000fbab.bin
8caeb5b8858f7cdcf34f9631359ef5afbdef31016a6a41b736682d67103a3c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 4748 bytes
font_01_sfnt_off00010bd7.bin
dccbb3730c29c4769a4d5713d7b58449a0731a32a897c5ab79493d9abfd0ebbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 11392 bytes
font_02_sfnt_off00013291.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13291 4324 bytes

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