Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72eff1e250900c7…

MALICIOUS

PDF

95.9 KB Created: 2021-02-14 16:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c5b0845775e743db53a3fa12e8327b3 SHA-1: 3f17de1273e85a34865b0776914f889028fdbfb1 SHA-256: a72eff1e250900c74e8735c2337fd4de08ddf5894b7d0f1ad53a743037366532
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=find+the+cat+answer+twitter PDF link annotation
    • https://falusawo.weebly.com/uploads/1/3/6/0/136084102/noredinebepu.pdfIn PDF document text
    • http://sluzhba1.net/download_lathe_simulator_mod_apk_terbarue61uk.pdfIn PDF document text
    • http://pipvip.ru/60304366681r89t4.pdfIn PDF document text
    • http://myirn.icu/aadhar_card_size_in_word_formatzg0b0.pdfIn PDF document text
    • http://how2clever.com/nbp_internship_report_slidesharehm8g8.pdfIn PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/bevunawi.pdfIn PDF document text
    • https://nojefawagalubab.weebly.com/uploads/1/3/4/2/134266261/9590089.pdfIn PDF document text
    • http://espaceabone.com/spider_man_3_game_apk_obb8gqta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/2256387395.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/online_cricket_betting_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/ceven_trke_okunuu_ve_meali.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 3136 bytes
SHA-256: d7a74a8f7f5b6061d1704e49d55b25e97137b941398fa138ccd077d4d208d331
font_01_sfnt_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 4720 bytes
SHA-256: 5ca1756a15f0c91d3552a037e5094ef2fd4bc83872351b3b3b31867ac3aaa919
font_02_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 6168 bytes
SHA-256: 9ef3e6b80631d7df16e26a8f14ae21e6942e94e36f0fb4c75c5d82fab402cfb6
font_03_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 9584 bytes
SHA-256: 11ed226f1a712701d2053896c60b08f712c3bcf830a3b5a33ee9511558009c15
font_04_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 11632 bytes
SHA-256: a8e34ade24fd0bcf27c9d76b650de5859f77ad07338b4e6cacefbb3a527fd775
font_05_sfnt_off0001498b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498B 17636 bytes
SHA-256: 84f606d39a0fadf5e7ad59538b1c5254e5ebbc19af4745542f10ab737faa5284
font_06_sfnt_off00016340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16340 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f