Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39d510f04dd27a5…

MALICIOUS

PDF

84.5 KB Created: 2021-04-30 13:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4f4f825f94483dbe396026ba174e5c01 SHA-1: 47d8d552a5e7c1de2f62c9b70c03fef2aa1ece92 SHA-256: a39d510f04dd27a5de8b5ab7fb1ccfcbb8804d9111f7155988315c0e49eafd7b
214 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or redirection attempt. It contains numerous links, with one specifically pointing to known malicious redirector infrastructure at 'https://yafferge.ru/strik?utm_term=how+to+make+your+own+surf+fishing+rigs'. The document body, though partially corrupted, suggests a lure related to 'surf fishing rigs' to entice users to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+make+your+own+surf+fishing+rigs In PDF document text
    • https://kilifunilazavef.weebly.com/uploads/1/3/4/4/134481566/biretowaribufoje.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/raxobugoboda_solufimazujiw_zowojoji.pdfIn PDF document text
    • https://saniruguroxi.weebly.com/uploads/1/3/4/5/134585545/6222595.pdfIn PDF document text
    • https://punuvenow.weebly.com/uploads/1/3/4/4/134445800/junuridal_kaxobiviwi.pdfIn PDF document text
    • https://fibetenozogu.weebly.com/uploads/1/3/0/8/130813768/d971fcbc90f62ea.pdfIn PDF document text
    • https://vazonani.weebly.com/uploads/1/3/1/8/131871537/gesib.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/ranuzaka.pdfIn PDF document text
    • https://faxarumi.weebly.com/uploads/1/3/1/6/131606834/sexisisudadozop-burutabexovu-bijiwavugemuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_6df01a8d06564a96b43dd3fdcf45adfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapite/wreckfest_xbox_one_x_performance.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_ad2c7c40746442a88e16c52cb93bec2e.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_ca9051a9ebed454481960e3467dcb72c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/tewelekogivuxipib.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/butebolikuxosodep.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/17821469741.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_39aa2c42445c4fa2aa2ff6ac43c4109e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pomaxa/sodimeburupe.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/wiviwuvavima.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_8c7a999818e542cdbaf70a2ad0ad60aa.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_743498fffd7e436b8fc6dfb1eefa88af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gosete/43690930318.pdfIn PDF document text
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_66460a006441461ab2da501484a75367.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mavixu/karcher_pressure_cleaner_wand.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_3aed2ff6be8749129d3ccd652ea57dd6.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_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 5368 bytes
SHA-256: 7a4eb78e7a9e3c447073552c63e7eb8e2b6048b71c804023ac501faaa36a2947
font_01_sfnt_off00011e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 11196 bytes
SHA-256: ec7ec0a638f204a0d61dac1e873f421935e83b8a388eba4818d2509f2b167724