Malicious PDF — malware analysis report

Static analysis result for SHA-256 8122019e3d8d8c72…

MALICIOUS

PDF

72.9 KB Created: 2021-03-09 14:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0627a5d61279e907ce13e3b4529cba86 SHA-1: 1cb35af2dfa5c1484b2139cd384dceb767051f4c SHA-256: 8122019e3d8d8c7250426e9df8fb14b358722d4272a1401956a2bd8213f30b29
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting an attempt to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://dafemum.ru/wb?keyword=noun%20worksheet%20for%20class%203%20with%20answers In PDF document text
    • https://zonotilikoper.weebly.com/uploads/1/3/1/0/131071062/kadulufotogagekaju.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/wepobisisujupiloj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5fe6a822994f2.pdfIn PDF document text
    • https://zeruposizagaki.weebly.com/uploads/1/3/4/8/134854722/julup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_5fda618269e2e.pdfIn PDF document text
    • https://wijugiretatito.weebly.com/uploads/1/3/2/8/132814958/1886cec159eb1.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/53536f7.pdfIn PDF document text
    • https://niwonuruvi.weebly.com/uploads/1/3/4/7/134767359/bc65f.pdfIn PDF document text
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/c5fd2f.pdfIn PDF document text
    • https://sesuxaned.weebly.com/uploads/1/3/5/3/135349378/tegetabuxoniwe.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/rorives/vefifatetebuz.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/how_to_cook_maggianos_take_home_lasagna.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/architecture_cv_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/tunikeburuwikikexaxarunif.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/toribapopigidewotadonoli.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/android_toolbar_text_color_xml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e123f02-5abb-426b-9370-08c99b0d31d2/wafojimitepamera.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/types_of_antibiotics_and_mode_of_action.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/68691241955.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/preterito_pluscuamperfecto_de_subjuntivo_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4744810b-6948-457c-ac47-2eef4895e1ae/38725619194.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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 5260 bytes
SHA-256: 358cf84e088cfe09b3bfcdfa01edfd37e144042c0e720604ca5e4c4f4b97a4b7
font_01_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 10308 bytes
SHA-256: de3825332fe02f67ead5c81a41ac0727a035f7bf70f3b4258ea37279fa1bac49

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