Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d53bb562e1d9ab8…

MALICIOUS

PDF

93.5 KB Created: 2021-04-01 15:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bceba4d02f289bda74952145c231b9ce SHA-1: d8fafbd96177f73327c60768984345e53ce4ee18 SHA-256: 1d53bb562e1d9ab846e5778bd12325f020687c2631af671fce242c47f7c54b39
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO spam operation. ClamAV and ML classifiers identified the PDF as malicious, specifically as a phishing trojan. The embedded URL and the link farm structure suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://jottigo.ru/wix?keyword=t%25C3%25AAn+con+trai+ti%25E1%25BA%25BFng+anh PDF link annotation
    • http://figuzunifowet.iblogger.org/41887504141.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/95923753202.pdfIn PDF document text
    • http://relofol.iblogger.org/saaho_movie_bad_boy_mp4_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_876e7b5a75d1411cbf9c5018446a5128.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_4e1dce2582594d83ac03448417291cf8.pdf?index=trueIn PDF document text
    • http://govakuvi.epizy.com/zopozezolo.pdfIn PDF document text
    • http://jaduwogozomikuj.epizy.com/91317831064.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_8a0cd38dacf04de6a6d908a5b7a481a9.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_46540484eefd4cb396c2821735bce40f.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_c0d6947875ea438fa0f131fd772ed131.pdf?index=trueIn PDF document text
    • http://tidewoxawutose.epizy.com/auto_tap_android_no_root_apk.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_79e1fd49316541608803f53f8b8dadb8.pdf?index=trueIn PDF document text
    • http://zasidad.epizy.com/45730949740.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_50e789a69f3240baa5980dccfc681598.pdf?index=trueIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_30d2f0b8c2284d2d9259a84d2cab496e.pdf?index=trueIn PDF document text
    • http://foripoj.epizy.com/chemistry_if8766_page_67_answers.pdfIn PDF document text
    • https://82e7f058-9c2a-4352-8e65-a162d98cde11.filesusr.com/ugd/ba3c76_70576c611484412a9df8400dcc1bbb60.pdf?index=trueIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_51687c716f604023b1528d548852516b.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_8317e0a3863849cb98e675eaedab420c.pdf?index=trueIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/12061337723.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_301806f3c6854959980e36a24f6fdeb2.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_4d4f49c1b73c4b9bb6a09a6f6afd97cb.pdf?index=trueIn 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_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 5120 bytes
SHA-256: 0296b440d3053f9799d3ce79282bd449fd69e4d6b1fe560071e6f9cb3d5c6c97
font_01_sfnt_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 23940 bytes
SHA-256: 10d131c8f26e8c3b4fac53e3abe2f88cac7cb1e00339807de7631a6fb6c69e8a

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