Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc71067ae16fafb…

MALICIOUS

PDF

76.1 KB Created: 2020-12-16 13:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 535506838acad50170cf45adaa58e439 SHA-1: 7752d6f2ba036469f6e7e4c6207d44c680a72457 SHA-256: 0fc71067ae16fafbdec016da4c7afd225d922fac83371df673cd1973d14264d3
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with many pointing to redirector infrastructure and a link farm. This suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/strik?utm_term=maoyuu+maou+yuusha+ending
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/d6187b2fbe.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/tojejasevodo.pdf
    • https://cdn-cms.f-static.net/uploads/4450734/normal_5f9f85538e2ae.pdf
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/ziwexaluzo.pdf
    • https://cdn-cms.f-static.net/uploads/4445324/normal_5fc0705455467.pdf
    • https://cdn-cms.f-static.net/uploads/4417213/normal_5f9f65fd7657b.pdf
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/3710f5cebcc8.pdf
    • https://weduzoviduluwiz.weebly.com/uploads/1/3/4/3/134385862/2394357.pdf
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f9194614d7b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdff793c02f22b9dd3a5bc/1606287228334/troy_bilt_pony_instruction_manual.pdf
    • https://static1.squarespace.com/static/5fc4daea8787e879898531d2/t/5fc840e4f97c193540e911e0/1606959333015/patebep.pdf
    • https://static1.squarespace.com/static/5fc2ca6ebdb33045eece7b0b/t/5fc95b7734a7c95099ebfd71/1607031672021/31906452550.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf04.bin
ee327dc0d88fc6e60419950e2aef3c7197702915c380dd78929ca01ce191e90d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF04 5220 bytes
font_01_sfnt_off0000d111.bin
15d173d0ad901b02b839aa30fb0128607170fd56f3bb57e5cb7bdac955dc4a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD111 5216 bytes
font_02_sfnt_off0000e2b7.bin
0ee30a7ffcbb5fcc387db0305063882b96c92b2fce4316cc60337edf5d377435		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 10292 bytes
font_03_sfnt_off0000ffcb.bin
9a8bd21e8fdb1bb6d97aa9b49fad46a93b2ddd727cce4169b6012d194a38c775		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 10460 bytes

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