Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3519528516fa0fa…

MALICIOUS

PDF

90.1 KB Created: 2021-03-31 19:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cd2f3009ffc75a50e38ab3a8ccd7068d SHA-1: 737feca9c61eca38620d875d7e2cefb7608368c7 SHA-256: b3519528516fa0fa3e2badecb72aede39154c5a558315fa3445d70bf5e7413a8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain, likely serving as a lure for phishing or malware distribution. The document body, though heavily obfuscated, suggests a context related to a lab report, which is a common pretext for social engineering.

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
  • 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/123?utm_term=determination+of+ascorbic+acid+lab+report PDF link annotation
    • http://reflectionss.space/bapadurovopexejanawasugi9m9rh.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/8223912.pdfIn PDF document text
    • https://bugabomusajo.weebly.com/uploads/1/3/4/5/134509224/915209.pdfIn PDF document text
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/girefudobor-vemifefopo-tunirakasa-tivefoxopekavub.pdfIn PDF document text
    • http://theandyhong.com/6273015177hdvz4.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/mokekufoxozedewapuw.pdfIn PDF document text
    • http://mp4.design/kesugovobakevojifes53.pdfIn PDF document text
    • http://galoomer.online/dilowac8nme.pdfIn PDF document text
    • http://liolika-rsya.ru/38091084238bnycu.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://funseeds.site/fishing_guide_fortescue_river_mouthyedi7.pdfIn PDF document text
    • http://salebox.shop/86481400701kgv9b.pdfIn PDF document text
    • http://good-production20.site/66810219490877oo.pdfIn PDF document text
    • http://3gusevshop.space/63120769184k2oq.pdfIn PDF document text
    • http://islta.fun/pubuvekawameladijamigauogyq.pdfIn PDF document text
    • http://cryogen.me/539085707367uzjl.pdfIn PDF document text
    • https://jikabokuw.weebly.com/uploads/1/3/4/6/134658058/voranino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f17e237-a545-47eb-88a9-4010423f6e17/metivibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc482021-7bcf-49df-838c-645c73518674/safojeluti.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 5440 bytes
SHA-256: c5a8e24be7bd091b09160cd00c0c1a33d84fb8a84fd3cb7f19295f029e0ada54
font_01_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 6168 bytes
SHA-256: 51f26cee5ad250be6b0238dafe99199974925ee943fc9423ca076f2eeab24592
font_02_sfnt_off00013261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 11776 bytes
SHA-256: 1a8087cf23c06a43f0c82eb5db18716a638f96069ac253da3d124b59404755fe

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