Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45c1abf500fe32d…

MALICIOUS

PDF

68.1 KB Created: 2020-12-06 19:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef104870d938f89048a2c4540b5af1c6 SHA-1: 1927e7f776519cbae09cebcdc85aeadbc2cf921e SHA-256: b45c1abf500fe32d5d08facf6326f5fefe3cd8c7a7a284c74314c794d55a588c
214 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or redirection attempt, likely to deliver a second-stage payload or lead users to fraudulent content. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=it+2+drive+mp4
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/zuvutogimi-tokatonoj.pdf
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/lupada.pdf
    • https://faxitovi.weebly.com/uploads/1/3/4/3/134379512/3124755.pdf
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/70cd4bfc584caf.pdf
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/lugot.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/9b03855b72dcb8.pdf
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/ruxozukozuvazu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3cfdd3ab-2e4d-4908-ba14-4032981776e0/23431732196.pdf
    • https://uploads.strikinglycdn.com/files/cc3e36c0-df74-47f9-a8ee-e253122453f9/gentle_art_of_verbal_self-defense.pdf
    • https://static1.squarespace.com/static/5fc6438fbdb33045eee6a409/t/5fca121ccf87d0256ff340be/1607078428601/the_weather_channel_iphone_app_delete_location.pdf
    • https://uploads.strikinglycdn.com/files/96562ad8-47fe-40c8-badb-326aaea548af/gay_group_rape.pdf
    • https://static1.squarespace.com/static/5fc4ca9c17e7202640030589/t/5fc534a1e6d49a06bb3bcd9f/1606759586347/kezat.pdf
    • https://uploads.strikinglycdn.com/files/7f1c9823-48c2-4d77-b295-e7b3ffb30e96/13411150864.pdf
    • https://uploads.strikinglycdn.com/files/f5ad4dee-f349-4604-a245-c457c8ded76e/86265125676.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_off0000d09b.bin
b839ae85010b07e6fb2aed613f88c7e38052fe907ca151e22deef7d43eb99d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 4900 bytes
font_01_sfnt_off0000e143.bin
bf3ee3df50569a3e5e43e632310165dd76b7bdbdbff5a0defea1cacc12d697ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 10140 bytes

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