Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1057159c73560e0…

MALICIOUS

PDF

80.9 KB Created: 2021-04-06 01:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f189c9094f2600eda947b3386d66123 SHA-1: c084df2bce5c0fcc99b314f57c96aa77950951e0 SHA-256: b1057159c73560e0594dc81fce9dddd22edf889708da39166a19cdfe7c3743c2
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a 'God of Carnage' review, likely to entice clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://yafferge.ru/strik?utm_term=god+of+carnage+broadway+review
    • http://antonioita.fun/50351736464rdgfg.pdf
    • http://everydayy.fun/9840825093ylf7o.pdf
    • http://urro-hu.com/26265478067t3haz.pdf
    • http://marketitaly.pro/budivovulutopezeg7605c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pibajuwi/depujojikege.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/76655862774.pdf
    • https://uploads.strikinglycdn.com/files/98f5b2b6-efb2-4bdc-8ad9-2c5afc9ccf5d/wuxevigam.pdf
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_f44407373d594c2ea2d47b04359b8837.pdf?index=true
    • https://uploads.strikinglycdn.com/files/56de69fb-6e2a-4d69-a8a0-112c6e66622a/dirk_gentlys_holistic_detective_agency_streaming_ita.pdf
    • https://s3.amazonaws.com/lezopobigeza/platos_republic_book_7_full_text.pdf
    • https://uploads.strikinglycdn.com/files/37685e08-bc83-45fe-8ac1-02f6532e1d81/list_of_spanish_grammar_rules.pdf
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_e80d6c809acf4904b72fdeb59c6a8577.pdf?index=true
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_f94c80b0625442688d05e4ed2e339da3.pdf?index=true
    • https://s3.amazonaws.com/viwoxuz/understanding_file_structure.pdf
    • https://s3.amazonaws.com/farowug/15707557547.pdf
    • https://s3.amazonaws.com/jinabom/xakulebojozijuf.pdf
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_d5931c98a2684fddb33c368a0e5f3a44.pdf?index=true
    • https://s3.amazonaws.com/dazinibonofobi/wirasobiburubik.pdf
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_03bdfbdcc6e4426c90aaaa143a9f920e.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_894d3bf0fd6e4424b543fc6e54d42f0c.pdf?index=true
    • https://s3.amazonaws.com/mejados/zedomulogulafixapovewedej.pdf
    • https://uploads.strikinglycdn.com/files/9fec51c7-27ce-41fb-a60a-80df45114368/60162546360.pdf
    • https://s3.amazonaws.com/natewared/bhaigiri_2_movie_filmywap.pdf
    • https://s3.amazonaws.com/towutoginadivu/perfect_clarinet_sheet_music.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_off0000fc31.bin
1065f834aa18071d3ad2c6572c445c9a8e36adb109bae5c8ea59271545a2e0f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 5404 bytes
font_01_sfnt_off00010ec6.bin
838f42773729764f6bebe8e62cffb48f05746b00396df01924dca07d2ca7423f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 11220 bytes

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