Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81cd9d5b209bd22…

MALICIOUS

PDF

79.4 KB Created: 2021-03-21 05:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba99723de2a001eeb6c275a39650e4cc SHA-1: 556618fed04abbeb370dcb0dbbb7b38f43a3cf0c SHA-256: a81cd9d5b209bd22d22a7a599b9cf93c353766ccab25eb26244cde7f4cf9da38
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=apple+quartz+filter+pdf
    • https://zoladikadaxupaj.weebly.com/uploads/1/3/4/6/134635808/wokuxidufavuvatamar.pdf
    • http://betmoy57.com/88825274192v6ng8.pdf
    • https://juzopuxenepin.weebly.com/uploads/1/3/5/3/135383483/5576245.pdf
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/6821262.pdf
    • https://winomawapaba.weebly.com/uploads/1/3/5/3/135334931/ea729367e04ed.pdf
    • http://wwwbcpzonasegura-viabcp.com/62502455553xyvym.pdf
    • https://nobigifawu.weebly.com/uploads/1/3/4/3/134310244/38cd39b92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://difavokagakaruw.epizy.com/audio_technica_lp120_bluetooth_adapter.pdf
    • https://s3.amazonaws.com/xugigabitulu/91891481341.pdf
    • https://s3.amazonaws.com/wobuzisibal/12050373155.pdf
    • http://kajalefaruw.epizy.com/xuwubowo.pdf
    • https://s3.amazonaws.com/lowebemuwojiso/sozodatuk.pdf
    • https://s3.amazonaws.com/sitozi/twitter_integration_in_android.pdf
    • https://s3.amazonaws.com/nilafafakem/15021410458.pdf
    • http://jegovogetaferop.epizy.com/panasonic_dmr-ez48v_dvd_vhs_recorder_manual.pdf
    • https://s3.amazonaws.com/tojabixefova/sewumikuwizudubegizab.pdf
    • https://s3.amazonaws.com/petikamov/accounts_payable_ledger_format_in_excel.pdf
    • https://s3.amazonaws.com/sikuva/cheran_pandiyan_movie_songs_in_starmusiq.pdf
    • https://s3.amazonaws.com/taguxif/fevoke.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc4.bin
3a8d9c3594f3120d58e3cf1ac4b2ae31da763601e5ff00ee7707022944c9c562		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 4688 bytes
font_01_sfnt_off0000fbc6.bin
417b9f78566f074c7d3fc3590ea09e7fff80b2749ca625e3e9d2ceb01b0e2719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 11144 bytes
font_02_sfnt_off000121d0.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 4324 bytes

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