Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829ea6f4dff7ca3…

MALICIOUS

PDF

85.1 KB Created: 2021-04-02 07:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a2c059b3c5d8745377aa8905e79c7671 SHA-1: c139f2ba9a864a4359f3083873e02b42046290be SHA-256: e829ea6f4dff7ca36ce59998a72adb31c922f6c882412895df59c5b05fd36e65
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nipisod.ru/wix?keyword=2012+lund+pro+guide+1825+specs PDF link annotation
    • http://capridigi.com/vetegalmftmh.pdfIn PDF document text
    • http://taygerr.com/78056329145rfl2j.pdfIn PDF document text
    • http://zoo-taxi.site/whatsapp_apk_mirror_2._19._282ychh0.pdfIn PDF document text
    • http://lesantyqas.online/77327526596k8avi.pdfIn PDF document text
    • http://natfreshik.fun/how_to_write_a_simple_song_lyricsv64wb.pdfIn PDF document text
    • http://armada.technology/xakempya90.pdfIn PDF document text
    • http://helpverifybadges.com/xusoxunofetaxajutozajizesvwye9.pdfIn PDF document text
    • http://nikaold.site/debetiluvomixowekuljez3.pdfIn PDF document text
    • http://megatorg.ru/12399532481ar8s4.pdfIn PDF document text
    • http://like-store.site/konatenexo447yb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_45c66cd09d7f461abe929a79001efe18.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_2a633164045c4286bb2e85ddfc69d7a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/what_is_galarian_pokemon.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_5003a72ad1304a47aceb8c6b52f0880f.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_ebad0023618d408086c55f277a64bde6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/vegerumepomaxolazuxubizo.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/latest_australian_cpr_guidelines.pdfIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_31ddba19195d41c8bde6e018e83485b8.pdf?index=trueIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_262793e1f5e14d98af7c0bf3b385f317.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_8b41cdd8d7284f0c9c36d2ec4f5aee26.pdf?index=trueIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_fb7dbcac8adb48a2b9c9525b73e78adc.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_ca033cf602454ca9956ea439cee83f2d.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_34ed340dc21e4d15bb5627011cbbf078.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezorito/rizifimagupejakes.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_49ca034e26ef4332889ecdea981b6972.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_7a762c3882c54bbba8dc3b3590d34837.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 5580 bytes
SHA-256: 88d6c1531f5b8ee7d469f6ac1ff48e5fc1b1ba5ca6bd408fcb3ad1fd891a1569
font_01_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 11568 bytes
SHA-256: 726d92cb1eb69b1e79848c0466bebe2827e46679dbd6a1cc6582d715695e9c1c
font_02_sfnt_off0001305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305D 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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