Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43a3aa123b90e0b…

MALICIOUS

PDF

66.9 KB Created: 2021-03-23 15:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed36554b86e91f6acc759cd11bef0afc SHA-1: b478198921f6c6a64bd24b169c302eccc2785223 SHA-256: a43a3aa123b90e0b7f2c7d39a2a2957d36c3517dc5e90d9fa25f7ac63a0cce07
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=cells+unit+test+answers
    • http://noxogejukebe.mypressonline.com/40420368854.pdf
    • https://cdn.sqhk.co/satofapo/apjfjis/dajosimojobunok.pdf
    • https://cdn.sqhk.co/ripowusaro/jcgjgcs/funny_animated_emoticons.pdf
    • http://jemulobapamiwu.mywebcommunity.org/nirun.pdf
    • http://mavigawika.scienceontheweb.net/16944880002.pdf
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/gututitimidatoxi.pdf
    • https://tozuvosakum.weebly.com/uploads/1/3/4/4/134471329/3104848.pdf
    • https://cdn-cms.f-static.net/uploads/4392656/normal_604fef541b4ae.pdf
    • https://cdn.sqhk.co/fafujedajir/ejeggL6/76350676725.pdf
    • https://cdn.sqhk.co/sozivowemin/gdK60ij/pentagon_wars_quotes.pdf
    • https://static.s123-cdn-static.com/uploads/4470552/normal_5fffe49caa6e8.pdf
    • https://cdn.sqhk.co/dowusutitozi/qiiQ7hi/45661601430.pdf
    • https://cdn-cms.f-static.net/uploads/4488329/normal_603f9d33350f0.pdf
    • https://cdn.sqhk.co/remokuvupen/4ibjegc/zogobekuzabopefol.pdf
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/c7c6fa15a.pdf
    • https://cdn.sqhk.co/setewefasari/bhgeQjc/lego_marvel_super_heroes_game_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4456140/normal_603d40fd7b81b.pdf
    • https://cdn.sqhk.co/jatobeguji/a4ia7hf/bamuzu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lexaxadodazab.rf.gd/what_is_the_towing_capacity_of_a_2011_ford_ranger.pdf
    • http://namepafubi.atwebpages.com/beyond_compare_download.pdf
    • http://sanubexudo.rf.gd/issn_sports_nutrition_guidelines.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_off0000cb82.bin
85a882e6005397ea144fbabd8aa985b2572a59e832fac00d7394f665d7baf500		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 4676 bytes
font_01_sfnt_off0000db82.bin
60e9d0521f6aeda23fc979d8f6397de4cfbac0d611a1185feef46c88e1addb72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 10132 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.