Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec87c33f86c8193…

MALICIOUS

PDF

72.3 KB Created: 2021-01-20 07:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6b1eba1a1d3160b9828db9205d65305f SHA-1: b2fd5a113882effcf8c47facae99cf5ef5eeff95 SHA-256: 7ec87c33f86c81931fb0a429bee6fc293f4ef3be0133863c67a6297d602d853b
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to a 'Bachmann train instruction manual'. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=bachmann+train+instruction+manual In PDF document text
    • https://site-1168371.mozfiles.com/files/1168371/79658034743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452593/normal_5fcd6580244a3.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/mix_video_player_app.pdfIn PDF document text
    • https://site-1172238.mozfiles.com/files/1172238/best_free_video_editing_app_for_android_phone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368226/normal_5ffcd6b2deb65.pdfIn PDF document text
    • https://cdn.sqhk.co/vozedolurezu/HWjhYid/dusttale_last_genocide_phase_3.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/Gjj4jgd/91197186974.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/Kibhhgi/detective_conan_movie_2019_release_dates.pdfIn PDF document text
    • https://site-1171132.mozfiles.com/files/1171132/brinkmann_6_burner_gas_grill_manual.pdfIn PDF document text
    • https://site-1259073.mozfiles.com/files/1259073/8978191848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467007/normal_5fb9bb3c9acb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5fc185c98e1ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_5fa45cbf3b990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498842/normal_5fda386dd205f.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/wajibile/bangla_sms_picture.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/lakeloxikasukamejajax.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/1992018570.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/ambedkar_photos_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/math_worksheet_creator_addition.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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 5088 bytes
SHA-256: e47781ce78dd8502eabfe6c3a3b602a4a9974d32ec8def6a5b7fac12207690b6
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 12568 bytes
SHA-256: 874b529bef52ed0d1eeb0d8ed555fdf983a762c6e867cd1035b7e9097bc19718

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