Malicious PDF — malware analysis report

Static analysis result for SHA-256 c280aae705341089…

MALICIOUS

PDF

141.2 KB Created: 2021-03-25 00:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 608d77c4a8b6d3b7bb03e9bd35140469 SHA-1: 569af3dad8a62b094a0fb261a61621a21ddde6e4 SHA-256: c280aae705341089174221ee2522085296f4a1bac41c44bf304c441cf613e12e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/123?utm_term=l%2526+t+annual+report+2018+pdf PDF link annotation
    • https://cdn.sqhk.co/moserusoba/mhajajd/xulazunaz.pdfIn PDF document text
    • https://jotabejomunumog.weebly.com/uploads/1/3/0/8/130813846/4512909.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/bafanivepojomewa.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/gegggjC/72766733414.pdfIn PDF document text
    • https://vinatisuxuzelo.weebly.com/uploads/1/3/4/7/134770563/1894b877e1acc83.pdfIn PDF document text
    • http://nijubuwuw.iblogger.org/wagner_642_paint_sprayer_parts.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levovod/disanadipoxufi.pdfIn PDF document text
    • http://xofududegotu.epizy.com/motion_to_remand_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/96579816978.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_0547989d7bfc43ebb9262e6af8e05062.pdf?index=trueIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_98fdc55603084fbea9888c664fa66167.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remavuj/besamijifesuponokipa.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/31722023256.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_c092540959ea4b1cab6dacca3ea8065b.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_11b81baa48834f20bba6991ee4e75d0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wejuvono/bee_gees_hits_free.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/bella_13694_high_power_juice_extractor_reviews.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001c428.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C428 19712 bytes
SHA-256: 9cff0606b7355c16549ee4bd2fdbe7eb56a272d83baf6695c6224b9e179ed2c8
font_00_sfnt_off000149c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C2 34936 bytes
SHA-256: 7df87140eaacb7d1e78d722bac4a5062128f72b3dbeae9db0ac9673b1ff7fe56
font_01_sfnt_off0001b638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B638 4096 bytes
SHA-256: 52567436ad48912664827f1d487cdbdf53d3ede6de6b05036a7ded5753d0c940
font_03_sfnt_off0001f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8E1 14320 bytes
SHA-256: 2a95dad48090453741f30efb8361e9fa46c43ef63ea607a832cefd2677454e3b

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