Malicious PDF — malware analysis report

Static analysis result for SHA-256 a654ee9b041fc759…

MALICIOUS

PDF

78.8 KB Created: 2021-03-12 21:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c9d4217a9921c24ec137b1eb00f4765b SHA-1: 3a66b252cef3983354e3838a5a0066e9b992fc54 SHA-256: a654ee9b041fc759574d2fd75c455c82db2079c9b2902e53deb009ff4e9d9c73
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • 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://maypoin.ru/award?keyword=cancer+cells+growth+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369331/normal_60170052754b2.pdfIn PDF document text
    • https://rivebopufu.weebly.com/uploads/1/3/4/6/134663658/e19da1c.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/tivelelasaziwog.pdfIn PDF document text
    • http://bopikifej.22web.org/2460661915.pdfIn PDF document text
    • https://mejotowud.weebly.com/uploads/1/3/0/9/130969644/fdccd5ba.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/3169242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491157/normal_6040b169d374e.pdfIn PDF document text
    • https://kovelikazaw.weebly.com/uploads/1/3/4/7/134705675/6214297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_5fd27b25b999d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414352/normal_60311e6fa2de5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_5fe8b7961a6db.pdfIn PDF document text
    • http://fofakowusagafo.22web.org/64415317518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/fever_of_unknown_origin_nice_guidelines.pdfIn PDF document text
    • http://jexititojule.rf.gd/sklearn_classification_report_multilabel.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/causative_verb_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b0c155-96d7-4c1a-960a-0fd8d5721020/luxor.pdfIn PDF document text
    • http://jilevatawew.epizy.com/org._apache._spark._sql._sparksession_jar.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/cevital_bejaia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3dbb7f4-de77-478b-97f1-3fd9b9096926/39084190871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca5e337-faa5-4449-8299-483f801fa64c/does_netflix_have_look_whos_back.pdfIn PDF document text
    • http://mifusikiwo.epizy.com/xinunolerubipesas.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/hulu_live_tv_channel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/15659759102.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/85685405897.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/mupobomokewegukofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e2e3ba-150f-4525-b722-f2e46af3cc3b/how_do_i_connect_my_plantronics_headset_to_my_office_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/88940005793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba64ae20-6294-47e5-aa1c-08877fd69d79/nunuvekujifiwatatabila.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/36476989174.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 5416 bytes
SHA-256: c0845b345d227167453a20a2a1189aaae9499d60b62675fb2abe66db20099d35
font_01_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 10392 bytes
SHA-256: 3c6b6f03880163add8128f83bd1fc7c6a2a345990284d398f512f36f1c892385

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