Malicious PDF — malware analysis report

Static analysis result for SHA-256 319e39372cbe31f0…

MALICIOUS

PDF

78.7 KB Created: 2021-04-11 03:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c7c528f8dcb69a034c96e257138a3cac SHA-1: 4e86edfdd740c8ce97d081a978ed8b95e3c2c876 SHA-256: 319e39372cbe31f0c1b3fea66933fdbf9d7ab66e4f0c29082742500a4711033d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO poisoning or phishing. The primary URL, https://maypoin.ru/strik?utm_term=premiere+dehumidifier+how+to+use, suggests a lure related to dehumidifier usage, likely to direct users to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=premiere+dehumidifier+how+to+use PDF link annotation
    • https://kesevure.weebly.com/uploads/1/3/4/4/134497963/kedulomalepeme_jikujarorikufis_nawixubukak_zapogomalogopev.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/ohgidhh/24357003906.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/j2B4oid/82848183646.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/ij9ggRB/kleptocats_2_kitchen_purple_ribbon.pdfIn PDF document text
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/vevusiweze.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/5539819.pdfIn PDF document text
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/1583897.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/gfM0eid/bluestone_state_park_meador_campground_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/gavuxavexuresozatobimin.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/70332996288.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/vizio_vsb200_sound_bar_subwoofer.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/get_droidadmin_apk.pdfIn PDF document text
    • http://fategag.rf.gd/cladogram_analysis_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5355b63-6549-4dda-b8cc-d673a574fc07/watubisomegelijo.pdfIn PDF document text
    • http://rapuwovire.rf.gd/nubafakudolalimuzuv.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/65955168861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c855082-1b98-40be-9cad-9edfc19ab6ff/2005_f150_fx4_owners_manual.pdfIn PDF document text
    • http://basufalutu.epizy.com/38141287029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6175ed0a-eacb-4850-ac90-43315cca2d1b/what_is_the_best_5500_watt_portable_generator.pdfIn PDF document text
    • http://wabelat.epizy.com/68068213988.pdfIn PDF document text
    • http://foletakusuwavid.rf.gd/learn_java_programming_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899db305-cbea-4a32-96fa-1ff80518a45f/24118373208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b70d643-275f-49fd-a11a-198ce3e280af/69122369441.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 4996 bytes
SHA-256: 2e4fb77d3df69b633f50bd3ab70acc70643bacbcae0ddc2d92fb4eac80e8c9ee
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 10824 bytes
SHA-256: a1b86396927e6a984e1c52a2c981e3e9b088cb18aa408bbe61f74d9aff4c8b4b

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