Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d103c35eee7615…

MALICIOUS

PDF

86.9 KB Created: 2021-03-16 02:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 391124b9031df578965a2d106c69b154 SHA-1: 52bfbc84a0cf9e0c97feee5d3bc715b2d03f242d SHA-256: 31d103c35eee7615607c0b7c940df6ccf8394abe3466011e35d7f23f0927a8c0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL related to 'how to triforce in discord', indicating a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/wix?keyword=how+to+triforce+in+discord PDF link annotation
    • http://evilcheats.fun/wirafebiloluvuzexamahlgv5.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/gotifid-bonugu-kegupodelu.pdfIn PDF document text
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/loxavuginuwuro-wuzixaxose-nipoxivakufoja-ruwudewafak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5feafd8a96296.pdfIn PDF document text
    • http://hotel-engels.ru/22123048438hx84f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_5fdb67fc3d104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_60247475b9da8.pdfIn PDF document text
    • https://tibuvaji.weebly.com/uploads/1/3/4/7/134720571/9b01f83df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_604fa71bbe033.pdfIn PDF document text
    • https://xemalijojododud.weebly.com/uploads/1/3/0/9/130969235/xatazojowu-natetupojeseb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_601ed6b9b713a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393511/normal_5fccae0cd326f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405654/normal_60098e749d130.pdfIn PDF document text
    • http://minuette.me/533585183608wber.pdfIn PDF document text
    • http://3gusevshop.website/lamakosabuvujuxojovufde5l2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_604d4ac7182da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_5fd29760bcadd.pdfIn PDF document text
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/lokolagobiviza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_6018f52f86da9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480591/normal_604452ee5d69c.pdfIn PDF document text
    • http://sfhgfje5df.xyz/whats_in_a_name_activity_sheetrdl23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478148/normal_5ffd7b36394a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_abc11d64da5e4da5afc626d7a9cc778b.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_0cc83192ce0148c5949308bbc1e33245.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_21b2750498b14b84a35c85e40a83b9ee.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 4088 bytes
SHA-256: 37d571b70c213c384ade8e01be94904081c74a9f9e9cb873cc0b78912eec6753
font_01_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 4828 bytes
SHA-256: c7d7bb6888f441bf640b5ef27a022f7bfab2169cdee0530292da30ef20fecbd6
font_02_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 12404 bytes
SHA-256: f133058488fe0ccc58a666d95deb9789720e97589c10ffd19841f0657f177f67

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