Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bc1a4ce77dbe41…

MALICIOUS

PDF

78.5 KB Created: 2021-03-01 08:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61167aa0b8473409bc8aac0c5fdd35cf SHA-1: b1c1a9f456afc831aa245844d743bb77020186eb SHA-256: b4bc1a4ce77dbe418a81828d1e3c17aa4bccfd2e1260e618a4253d673ca0bce1
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that is disguised as helpful information, likely to trick the user into visiting a malicious site. No scripts were extracted, but the presence of an external URI and the ML/ClamAV detections strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=how+to+enter+letters+on+iphone+5+keypad
    • https://cdn.sqhk.co/medijamowole/EifU4gj/tunewogosuguniwitap.pdf
    • https://cdn.sqhk.co/podoxato/idxjiTR/9829917550.pdf
    • https://cdn.sqhk.co/juselivo/auU4DeV/94526434356.pdf
    • http://zesenadozefut.sportsontheweb.net/95099423156.pdf
    • http://nanonewe.scienceontheweb.net/how_to_count_calories_eating_out.pdf
    • https://cdn.sqhk.co/fosigigamef/fjbgiha/jozasovoli.pdf
    • https://cdn.sqhk.co/pajijolabalu/eiwridH/26261505724.pdf
    • https://cdn.sqhk.co/rizitewav/XticKjd/virus_attack_game_download.pdf
    • https://cdn.sqhk.co/fugolamudara/9ZH4gjG/fujedizuj.pdf
    • https://cdn.sqhk.co/jomonufo/g6jhV7C/best_funny_videos_for_whatsapp_free_download.pdf
    • http://digitalmicroteter.xyz/the_madwoman_in_the_attic_infection_in_the_sentence_summaryps3x8.pdf
    • http://onlineeshop24.xyz/division_fraction_word_problems_with_answersdfyie.pdf
    • http://kutatit.getenjoyment.net/yamaha_yas_203_soundbar.pdf
    • https://cdn.sqhk.co/mogizilo/JphdWlv/6968093508.pdf
    • http://lajodibibodi.getenjoyment.net/bojakigifo.pdf
    • http://vipadobotisituz.mygamesonline.org/97275479344.pdf
    • http://ledozikatiresev.scienceontheweb.net/88749332612.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zowofiz.myartsonline.com/user_manual_for_samsung_gt-p3113.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_off0000dea6.bin
b81fde46c6a4d9ba3b2b25e1fcbf18df1062908beed9a9c3c848cd622720cb68
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 5388 bytes
font_01_sfnt_off0000f104.bin
0471bfc0f07f07c617823d2e289babea5f4c257faddfa678293bf81d31d4efa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 10924 bytes
font_02_sfnt_off0001169f.bin
8fe31ac2096c5e11ca20e474ac9d4b0e624cd7c6a3d6648e58269b78a2b36287
pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 16304 bytes