Malicious PDF — malware analysis report

Static analysis result for SHA-256 470a343963ac9052…

MALICIOUS

PDF

73.2 KB Created: 2021-01-20 01:19:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0878fcc63bf10f7db6b1936373cae16e SHA-1: d35457ad43ddb718faef22888499d2d0e9f9be17 SHA-256: 470a343963ac9052a5209e91f0e12135130bd6cc7b19cb2b555a99383b118f9f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing numerous external URLs. The ML classifier and ClamAV also identified it as malicious. The primary attack pattern involves directing users to a large number of external websites, likely for phishing or to download further malicious content.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=chabot+space+%2526+science+center
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/dovoga_batevonis_wiromaxureguran_bosok.pdf
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/wumubozudiz.pdf
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/dowovuxixej.pdf
    • https://wiperorapaxomun.weebly.com/uploads/1/3/5/3/135323561/4922536.pdf
    • https://faxarumi.weebly.com/uploads/1/3/1/6/131606834/17e530915.pdf
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5f95389e6e3f0.pdf
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/68cb4b.pdf
    • https://site-1180216.mozfiles.com/files/1180216/bubble_tea_boba_flavors.pdf
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/jolenujerepexis.pdf
    • https://site-1180978.mozfiles.com/files/1180978/addition_coloring_sheets_for_kindergarten.pdf
    • https://site-1174259.mozfiles.com/files/1174259/sosewesekugopuzuro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jitoritobo.epizy.com/6299517463.pdf
    • https://s3.amazonaws.com/xetasif/85799252931.pdf
    • https://s3.amazonaws.com/sowewazulejewi/clock_worksheet_for_4th_grade.pdf
    • http://jexititojule.rf.gd/citroen_c3_picasso_workshop_manual.pdf
    • https://s3.amazonaws.com/nitizobuv/78098105098.pdf
    • https://s3.amazonaws.com/bejideba/tewiziwudoramuvadenebef.pdf
    • http://joriboka.epizy.com/53750681495.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0bb.bin
51bb9c888ee7410c6339bd4c065b51cf1155515fc11028f8a8185b30ddc5e68f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 4936 bytes
font_01_sfnt_off0000f17b.bin
228ee064f20e881fbfe988e1c4a55b31db04d7edbfb333fafa2c2e9d868639f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 10844 bytes