Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44ad4c91cbc45c7…

MALICIOUS

PDF

72.3 KB Created: 2021-01-04 17:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8ccff0ebfe8529fd15dd636adb3db1e8 SHA-1: 55dca10b274acc34b2e7c497ee957b9cfa07555b SHA-256: e44ad4c91cbc45c73e2f926402c79710e8c52191e00d12db069880b88fe5711f
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised as a free Android calculator application. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL likely leads to a second-stage payload or phishing page, attempting to exploit the user's interest in the advertised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/aws?utm_term=calculator+for+android+phone+free In PDF document text
    • https://cdn.sqhk.co/dokijesu/jOVdigf/piborukiselawer.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/ageojgj/best_70s_and_80s_rock_songs_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/nitaroxujedi/775cohg/mister_kung_fu_spectrum.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/cSyhBha/launch_fcu_account_number.pdfIn PDF document text
    • https://cdn.sqhk.co/wiluxuko/iuNhfhf/race_the_traffic_nitro_apk_download.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/rufonali/26764268646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f39451-25b9-45dc-a531-540f5cf285f0/land_of_the_goblins_quick_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8f3439-d043-4112-8664-31a1e78ca9ef/whispering_oaks_vineyard.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/downloading_google_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e7bdeb-d4d6-435e-8153-a0b80fb5dc1f/57020820664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d49c539-7aea-4ff5-b45f-6c2e9749874b/nogabizujebidatisiguwar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29876e35-41b4-45a5-828e-3641888500ae/jisko_duaon_mein_manga_mp3_song_down.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_off0000d09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09E 4968 bytes
SHA-256: 93dd2876fb23c922224875a6c46bd5c14406c36b5e0b3da02ae2f678be6f1c63
font_01_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 10696 bytes
SHA-256: d4ce8eedae97161f22541047fce349cd04e78223eb5d5b300840b7ea1a0f0b0a
font_02_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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