Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d4479858b8daf4…

MALICIOUS

PDF

71.3 KB Created: 2021-03-23 02:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1306afdc5f1e6e7d3838ef74eebc28f4 SHA-1: 2368bd432dc4f2c17698abe95f801986f3b7567c SHA-256: 58d4479858b8daf4f835cceaf20eb11d4ecab1df8b3778a5ef973762a3e15fac
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one pointing to a potential malware hosting site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/wix?keyword=aava+24-piece+flatware+set
    • https://xuzatikanuji.weebly.com/uploads/1/3/0/7/130775198/1464783.pdf
    • https://cdn.sqhk.co/zidezofa/2iaidpD/3554628734.pdf
    • https://cdn.sqhk.co/bevoroxur/PhggN3H/word_wipe_free_online_aarp.pdf
    • https://cdn.sqhk.co/luwesefizi/3hbz4N8/puwuwiwuke.pdf
    • http://tiriruno.sportsontheweb.net/84305039594.pdf
    • http://jojazinex.mygamesonline.org/bujalenenafis.pdf
    • http://zezasarasojid.mywebcommunity.org/8503406600.pdf
    • https://moxizeza.weebly.com/uploads/1/3/3/9/133999163/a456ec0.pdf
    • http://pebifakonek.sportsontheweb.net/disifapuwubagewewu.pdf
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/4900134.pdf
    • http://vifezitenof.getenjoyment.net/93238226625.pdf
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/1727d.pdf
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/a5313593a332b70.pdf
    • http://jefevivavifax.scienceontheweb.net/minn_kota_riptide_terrova_bt_80lb.pdf
    • https://cdn.sqhk.co/zanewijepex/gfajdhb/neon_pink_glitter_wallpaper.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nevabaza.atwebpages.com/konica_minolta_bizhub_185.pdf
    • https://s3.amazonaws.com/kotenu/smith_hutson_scholarship_sfa.pdf
    • https://s3.amazonaws.com/tosevud/73461608028.pdf
    • https://s3.amazonaws.com/bofake/funny_baby_crying_sound.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/dozunuge.pdf
    • https://s3.amazonaws.com/minabiwa/68904845403.pdf
    • https://s3.amazonaws.com/datarofapakil/fossil_q_explorist_hr_gen_4_vs_gen_5.pdf
    • https://s3.amazonaws.com/dorulusof/97761384075.pdf
    • http://teluroluxeterez.myartsonline.com/what_causes_a_transmission_to_get_stuck_in_gear.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_off0000d690.bin
19590f37438bf09aa3f1e67996443c34d84f146cc5cfcd9dcece6c518fb4882f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 5404 bytes
font_01_sfnt_off0000e92b.bin
0a3ca9ca19475659d9664ecc388609402c47b0ae0a536ae5dbba182b3a7db67c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 11444 bytes

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