Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced3eb9a72573398…

MALICIOUS

PDF

87.8 KB Created: 2021-03-11 00:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b2811323695359301b0b2ad3252dd876 SHA-1: 5e76408a3c90c287daed6eab5c64ebe786090e43 SHA-256: ced3eb9a72573398783ce8f19bfadc971fb231421e515c14eec1581ee55cf5c3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/wix?keyword=max+nattapol+diloknawarit+age PDF link annotation
    • http://famojefefe.iblogger.org/guide_book_nacte.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/jPjh5fz/50965235589.pdfIn PDF document text
    • https://cdn.sqhk.co/modesarox/BIihagd/business_information_management_major_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/pwV95ji/virus_scan_failed_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/cidlagh/vakapatanoxebetidilovi.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/dvhhbjj/hd_video_player_hd_video_player.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_e8f49f7c06a842cf8c769ef50b1ddd49.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_ee1da11828be4fbc904ffe0f681a2eda.pdf?index=trueIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_0fed73a8f9b34fcb90a1d809b94144a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c950e0d6-14bc-4ec6-b2db-b26da6aa89eb/how_much_is_s_box_of_joe_at_dunkin_donuts.pdfIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_b3484152234f455da63b7dc4c97158e8.pdf?index=trueIn PDF document text
    • http://vosimamasi.epizy.com/combloux_france_snow_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4211201-2c5a-4952-a507-4eb4dd44d696/28633604667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a559e738-6cbe-42b1-bfe8-60b2037ec9cf/14411842247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a07821-44ca-42dc-95b8-31ed349d3585/doctor_sleep_cast_wendy_torrance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23331cde-92fe-480d-a83d-0cd65ce9ac9c/ziximegavijuzokatut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849e6786-b08a-4ee0-90ba-e9c5093c74f5/learn_korean_in_30_days_book.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 3516 bytes
SHA-256: fd5d0194dc7dba26beac0fb5366ad404c796a3157b628029e18ec0846205d9d5
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 5176 bytes
SHA-256: 099b78a471c81cf9bbca5b11baea3085c21bbac1b74398d9afb07e2d0bdc3d25
font_02_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 2292 bytes
SHA-256: cf01e18a77b3416e6cb7d750fda513f00ed2b95ddbdbd0d8da74931e62b44016
font_03_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 9164 bytes
SHA-256: ddf6aa909e8a589aff26b1bbaf2aa62314c5277d4df40b9050971dbfe12d4721
font_04_sfnt_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 10392 bytes
SHA-256: 8209b4f9c32258c888b0591f581ec8ba724a84443dc3611460c86ddeaf44aa23
font_05_sfnt_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 16088 bytes
SHA-256: 51b8d4c4f17389d80b23040d591c0dccb099bca9103ea84f58116e310badbe13

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