Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbca51c2a2585339…

MALICIOUS

PDF

72.7 KB Created: 2021-04-04 17:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0b4f8a1a3f8da1b456cc8fbe3649552 SHA-1: 5c9edb757c69ed623826fab58f4ea4078297ec87 SHA-256: fbca51c2a2585339e9e28fcf59448c90f78fadeb876fdccf9f4441e198d1ab14
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to deceive search engines and users. The embedded URLs suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent.

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://druttle.ru/award?keyword=mario+benedetti+poes%25C3%25ADa+con+los+j%25C3%25B3venes+pdf
    • http://bellissimo.online/resnick_halliday_krane_volume_2_downloadz8sh5.pdf
    • http://esagafow.fun/yeh_shen_themegtlz5.pdf
    • http://nifazafagikoxa.medianewsonline.com/20649328615.pdf
    • https://cdn.sqhk.co/zarepowake/hbfhgIy/31965949585.pdf
    • http://loberas.22web.org/informatica_developer_workflow_guide_10._2.pdf
    • http://fijixedi.22web.org/vinowakafaxafifiki.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/lumix-rudawun-betawemofaka-lobipu.pdf
    • http://salizurewaki.mypressonline.com/5510754882.pdf
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/suxenifobopozatu.pdf
    • https://cdn.sqhk.co/lotazoza/enDibgj/army_toys_town_hack.pdf
    • https://cdn.sqhk.co/fowoleleda/fAijcgc/jarufev.pdf
    • https://cdn.sqhk.co/ronofumito/gdicBnP/bokugoj.pdf
    • http://lazetijetedal.iblogger.org/wotejekijolixafojusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_3210e604ee3b4a77a9a1eeb79eef257a.pdf?index=true
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_b323d65b390749f09657b506baa5604b.pdf?index=true
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_ca9f2bba0ddb49c0a66e2e4a21842359.pdf?index=true
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_d488a38a5ead4ed99566f4fc32ac98b8.pdf?index=true
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_1e6e0c13d9c340cdb535644e3f2d6347.pdf?index=true
    • 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_off0000d9c0.bin
4ad82bfa04a28da2c7f1dba0ac7fac439a5b0bfff80d6332f7937856b269b30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 5620 bytes
font_01_sfnt_off0000ecc2.bin
9c716d33453cb5a1ec57a49bdde9b58053405fe1237723463ce8f2ab34c05b75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 11784 bytes

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