Malicious PDF — malware analysis report

Static analysis result for SHA-256 510d58d98865cd94…

MALICIOUS

PDF

79.7 KB Created: 2021-04-08 09:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1bf9709e2b0dba4a1ca2c91ef53ab51e SHA-1: e6b281f443b6d144e06c871e27974e655e09cc1e SHA-256: 510d58d98865cd94630f31fd8e49cc22b87efc35259c6483752f51128eb08a81
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware. The document body, though obfuscated, contains a URL that appears to be a lure for a technical support scam or similar pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=why+my+ac+unit+is+not+cooling PDF link annotation
    • https://cdn.sqhk.co/bikakigiben/iIdicNA/zombie_world_war_z_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/J7xSdic/ladafopokebujakebagibane.pdfIn PDF document text
    • https://sifofazawovetix.weebly.com/uploads/1/3/0/7/130776166/gibeb.pdfIn PDF document text
    • http://choosenews.space/nesivenufusodolusi6edwh.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/f281a2572a505.pdfIn PDF document text
    • https://wemavepudobug.weebly.com/uploads/1/3/4/1/134108610/gidesasiwu_lutukapaweb_muzotexutasaruz.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/FicIyji/30343877388.pdfIn PDF document text
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/sabunawinasigozovu.pdfIn PDF document text
    • https://zejuraxarobepek.weebly.com/uploads/1/3/1/4/131407797/3975635.pdfIn PDF document text
    • http://ujjjrrrrr.space/867788463130yw4m.pdfIn PDF document text
    • https://mejavepo.weebly.com/uploads/1/3/1/4/131438157/ligofevox.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/haifjcu/crowder_peas_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/pavupaken/ibhhja1/40389669509.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/6256211.pdfIn PDF document text
    • https://mifoxafakefan.weebly.com/uploads/1/3/0/9/130969175/1695323.pdfIn PDF document text
    • http://organicnu.info/kivawesefue03xt.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://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_08ae7b5ef5d3495fa4c33375b11cd316.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_e663aad370a1476f873ff2dbe25585ad.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_50e40ba74e4249e3925befd615b321bc.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_e32990da02e74e37934c4795498d58c9.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_2447451ab83548d5862ba68122d910b2.pdf?index=trueIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_96e6886bcaf543448797495c8bbe43d0.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_ed01ab24f047423cb0c332d8e47ef448.pdf?index=trueIn PDF document text
    • https://504b7f7c-d27d-4f2b-a6eb-e8dc7cf660cf.filesusr.com/ugd/6ba015_05dda0e0980c47678541254d45743d04.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_b0c04df6a71f4e9f9a8151fc92995848.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 4996 bytes
SHA-256: 1c928bb3ff0e18e518f82cc3f53f92a2ee1a8f3c22abe30214b5a4275fcbfdb0
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 10748 bytes
SHA-256: 069b23ddfe5d73aed8afe89692b3d8b49617eb770bd6c71873b0ef6b1ceb31f2
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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