Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e62631393f2e838…

MALICIOUS

PDF

85.0 KB Created: 2021-02-17 16:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb151d440809e5e2b0d74aabe142563 SHA-1: d78660a2dba34f5993794ddbb2fdb6a92121f2ab SHA-256: 2e62631393f2e83850eec06e6b5c2fe0cacd75950b09e6d5a3301c886ca0350e
156 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 other PDFs, indicative of a link farm designed to improve SEO for malicious content. The primary URL suggests a lure related to 'Samsung refrigerator service manual pdf' to entice users. While no scripts were explicitly extracted, the PDF structure and extensive URL farm strongly suggest an attempt to redirect users to malicious sites or download further malicious content, likely leveraging embedded JavaScript for execution.

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-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/wix?keyword=samsung+refrigerator+service+manual+pdf
    • https://vifutezovabul.weebly.com/uploads/1/3/1/4/131408528/53eed6cf73ea9c.pdf
    • https://cdn-cms.f-static.net/uploads/4390074/normal_600a9fcad199c.pdf
    • https://static.s123-cdn-static.com/uploads/4386849/normal_5fca04520ed66.pdf
    • https://turabevov.weebly.com/uploads/1/3/0/9/130968962/a9e2ca5456d64.pdf
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/fobulepedu_malujiseli_tejugobugej_jiribani.pdf
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60209dc8bacc3.pdf
    • https://cdn.sqhk.co/xakatikakizi/0jf01id/snapped_killer_couples_season_6_episode_3.pdf
    • https://cdn.sqhk.co/libibajuzumu/an5hiRv/nuvofo.pdf
    • https://static.s123-cdn-static.com/uploads/4380680/normal_5fe1f76064cda.pdf
    • https://cdn.sqhk.co/rufomezin/ahfggTl/golf_clash_tommy_rookie.pdf
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/4217437.pdf
    • https://cdn.sqhk.co/tumosirewuw/gehgk4S/dark_side_of_the_moon_album_cover_poster.pdf
    • https://cdn.sqhk.co/kerosumumato/gifrieO/snake_zodiac_2020_monthly.pdf
    • https://cdn.sqhk.co/zekuxemelop/aQjNiek/power_rangers_legacy_wars_free_download_for_pc.pdf
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/928413.pdf
    • https://cdn.sqhk.co/ruxuvedije/Y28DeAD/boxing_last_night.pdf
    • https://cdn.sqhk.co/fatepotax/D3icwja/run_run_rudolph_luke_bryan_lyrics.pdf
    • https://cdn.sqhk.co/rubovadu/03wk7qW/37228877960.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/petuzutemixuvod/make_size_smaller_iphone.pdf
    • https://s3.amazonaws.com/lixisariwulo/autocad_2007_with_crack_64_bit.pdf
    • https://s3.amazonaws.com/xukanomarexumu/vowagogevaxezovovole.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24a.bin
2b1a54d9c2dd09565a9c960bb57f242a02b7c3ecee5384d173737ce7e90debe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 5636 bytes
font_01_sfnt_off00010574.bin
9f45db79fa3edf66173833752e8dc4ff26631b37a10309c67318485846f64f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 13600 bytes
font_02_sfnt_off000130b7.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 16164 bytes

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