Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec16db4e9c6784f…

MALICIOUS

PDF

76.7 KB Created: 2021-04-04 00:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d33d032085de77059787f594981b4322 SHA-1: 818646f238d92adcc4b652800316ad05f1d4127d SHA-256: 9ec16db4e9c6784ffa79637eb254b79239dcda89a843d4ab3736f8ef4d8d88c6
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to distribute or link to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous external links are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=que+significa+sentir+escalofrios+en+el+cuerpo
    • https://cdn-cms.f-static.net/uploads/4467007/normal_5fd3427f13aeb.pdf
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5fd34782ce256.pdf
    • http://kotiwiwax.iblogger.org/98988873038.pdf
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd63ff592404.pdf
    • https://cdn-cms.f-static.net/uploads/4374963/normal_602f1f29b0141.pdf
    • http://wovidako.22web.org/nowumafijojitokegekun.pdf
    • https://cdn-cms.f-static.net/uploads/4464862/normal_6034db9036a5d.pdf
    • http://rixerudawane.iblogger.org/kipot.pdf
    • https://cdn-cms.f-static.net/uploads/4421460/normal_6031e331ad67b.pdf
    • https://cdn-cms.f-static.net/uploads/4374848/normal_6019273a3b046.pdf
    • https://cdn-cms.f-static.net/uploads/4403429/normal_60437081121e3.pdf
    • https://cdn-cms.f-static.net/uploads/4408863/normal_5fd7a1af49848.pdf
    • https://cdn-cms.f-static.net/uploads/4445749/normal_604b6f0fc97ea.pdf
    • https://cdn-cms.f-static.net/uploads/4483388/normal_603df475e2942.pdf
    • https://static.s123-cdn-static.com/uploads/4448345/normal_5fdf8a42ad1ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lixuzo/90879369712.pdf
    • https://s3.amazonaws.com/vufuzewasi/comparisons_and_order_of_operations_with_fractions_calculator.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_d96d9641ce5641729250513a009f1fd5.pdf?index=true
    • https://s3.amazonaws.com/xuzakob/30043220084.pdf
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_b6370f410dca40009fb460424fa3ac22.pdf?index=true
    • http://tijekozevapika.epizy.com/what_is_educational_leadership_and_management.pdf
    • http://nivugugop.rf.gd/20547741819.pdf
    • https://s3.amazonaws.com/rorives/aankh_marey_video_song_tinyjuke.pdf
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_d8b85b71551c49d09a0f9709066ca4c1.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_off0000ece0.bin
5e63a9c413f9a373bbbc7dceb53b71e3a67c838b684c18ed740faa4e4aeba54a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 5244 bytes
font_01_sfnt_off0000fecf.bin
f4b651c167c92e11d7f2e2fa90f36a5d778e67086cb0db4cf8572c6e3ca2a64d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 11872 bytes

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