Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7b71cdf286916f…

MALICIOUS

PDF

95.4 KB Created: 2020-11-14 12:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e92f764cc0475110056841cc825b46c0 SHA-1: d4bdaa1ba8e9db3c92e0260904568dbc145d7ef3 SHA-256: ed7b71cdf286916f9d1031076fd1284e02aaa05c6e145862bd1d4809ce52220f
214 Risk Score

Malware Insights

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

The PDF contains critical heuristic firings indicating it links to known malicious redirector infrastructure and is part of a link farm. The ML classifier also flagged it with high confidence. While no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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
  • 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://gettraff.ru/123?utm_term=kim+jin-woo+winner
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5fa9b73c118cb.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/pefidenisivolel.pdf
    • https://cdn-cms.f-static.net/uploads/4384634/normal_5fa0bb737a193.pdf
    • https://lixojubenolida.weebly.com/uploads/1/3/4/3/134375882/d56ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f94a3bf6-d16c-4c64-86f9-3e5784da78e4/94585905973.pdf
    • https://s3.amazonaws.com/kubafezin/bokuzebabumabafidixepazix.pdf
    • https://s3.amazonaws.com/wapabefizosumi/62392062430.pdf
    • https://s3.amazonaws.com/memul/segov.pdf
    • https://uploads.strikinglycdn.com/files/51454fc8-a58b-4d8a-9888-2e09982f2ef5/gijifikuwadujojotenoxeni.pdf
    • https://s3.amazonaws.com/degisapemifa/soya_beans_farming_in_nigeria.pdf
    • https://s3.amazonaws.com/kelukakeb/nothing_but_the_truth_chapter_11.pdf
    • https://uploads.strikinglycdn.com/files/93ef538c-356d-440d-a24f-5e1b2b1b5be4/89453049475.pdf
    • https://s3.amazonaws.com/zetare/tufaje.pdf
    • 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_off00013b69.bin
acf5630678d9fedcc55b227dfd2af51ffee09ab027a3a68c9288a7e29e0678b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 4580 bytes
font_01_sfnt_off00014b00.bin
4f8b680b8b86591f5f28165a366e4c9757bbfa759644af905c9b64098dfa9dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B00 11052 bytes