Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d16de18c9384351…

MALICIOUS

PDF

74.0 KB Created: 2021-02-21 18:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0277b2767f214f34cb0876b60dfd8818 SHA-1: 36bcf665d9397d30be62fc731ddc981fb8bfec9c SHA-256: 5d16de18c938435144b2ea21a671e5a15fa8c9bd3c660f3fd22d4ab61f468651
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to a suspicious domain, likely intended to phish users for information. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing trojan. The document body, though heavily corrupted, suggests a lure related to tax forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=what+does+form+ssa+1099+look+like PDF link annotation
    • https://cdn.sqhk.co/nakijalufiw/jcegfhc/horse_jumping_games_y8.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/jjfidgh/jelesumuligesezekupaf.pdfIn PDF document text
    • http://bamebefexa.22web.org/voxel.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/fjvqgdS/coupon_keeper_2.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/8Wcjhm4/amazing_world_of_gumball_season_3_episode_4.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/jfidJie/universe_in_a_nutshell_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/fhhDyzq/desesoto.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/ambgjCU/numaguzepapuxamiwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gofiguj/xadawasovulokej.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/full_screen_hd_background_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/41793558200.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/zojemadexamituvekarifudi.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/knee_strengthening_exercises_spanish.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 5256 bytes
SHA-256: d0c5250a7d3f9323c57c22a6d4677ff3f943fda731e2116006846b53c6fe2bb0
font_01_sfnt_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 11092 bytes
SHA-256: 9fad08eb636264f6db8d67fb33abf467abaa2360adc74483e75502cd2fd0c7f2
font_02_sfnt_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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