Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1ba0b9ce1ec3fc…

MALICIOUS

PDF

75.6 KB Created: 2021-03-23 01:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 111a600ca45506ba311dd22e412e6f59 SHA-1: 0fd9c76b43a9c06a7889707c304db588554acfd0 SHA-256: dc1ba0b9ce1ec3fc42f280955986e5a3744fa8b5b5a3163b7390f72de61da82f
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent URL pointing to 'jottigo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, many of which are benign, but the presence of the malicious URL and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. No scripts were extracted, but the document structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/aws?utm_term=computer+programmer+certificate+salary
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e0671bbd-5f16-4d2f-801a-5efd30add83d/painting_ideas_for_watercolor.pdf
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_f6323794dba14095b65a7aa91030a80c.pdf?index=true
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_4867b087f44f40c7ad4a0bea1bc989e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/572f1fec-50b7-43c9-b506-bb16a9fbeea3/dark_souls_2_scholar_of_the_first_sin_boss_fight.pdf
    • https://s3.amazonaws.com/lakujusitejojet/pawizebujogifitizoder.pdf
    • https://uploads.strikinglycdn.com/files/87e1a34f-8204-4b30-890e-9c05a94f75ad/how_to_draw_cute_easy_things.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/korenozeleg.pdf
    • https://s3.amazonaws.com/gateme/2013_subaru_impreza_wrx_for_sale.pdf
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_967bce32346a466f9a28b173c224a0ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7c372e2e-7094-439d-a694-f8aa2d295dba/apple_ipod_nano_1st_generation_case.pdf
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_9c64db0e6a1844f38ab2fad293a78879.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a4c77b8d-1e5d-4038-ba43-88920951cf2c/deepa_durga_kavacham_lyrics_in_kannada.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_253f5dce45374b468c6777242aefc3a8.pdf?index=true
    • https://s3.amazonaws.com/netinuwa/kiwatibibofowigolafo.pdf
    • https://s3.amazonaws.com/devuxuzejozam/cant_help_falling_in_love_piano_chords_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/8950f8d9-a646-413e-aee2-608c051ae280/pemifagikerog.pdf
    • https://uploads.strikinglycdn.com/files/6628e6c0-235d-4957-bfc3-75ebb7adb9a3/i_am_singer_2019_ep_13.pdf
    • https://uploads.strikinglycdn.com/files/3a7908f1-bf8d-4b24-957e-fb8eb43f6b52/20024136442.pdf
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_1703ef66fd2e4b01b6a252a3469dc453.pdf?index=true
    • https://s3.amazonaws.com/simujix/47844939075.pdf
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_3401f3b177fc4ab09c5701667f57a501.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e781.bin
bf32f33a25af0de72aea70963684dec718a19d6db03f777502da5e18b094820a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 5340 bytes
font_01_sfnt_off0000f9a3.bin
5d5cb872b8319c17cafa7defea9ab380f98be0122a3d54420fe19a265b078168		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 11692 bytes

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