Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ac3987966d2081…

MALICIOUS

PDF

80.0 KB Created: 2021-03-22 20:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1b31d926f1652936ea96cd1dbb174df7 SHA-1: e8a464051e77af33e7954e1069b457822986ca6e SHA-256: 88ac3987966d2081c6e6c9274cd3f8ca614e1f296e45dfd6690981b52fcab7b7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. ClamAV detected it as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The embedded URLs and the heuristic firings point towards an attempt to redirect users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/aws?utm_term=nuevo+c%25C3%25B3digo+civil+puerto+rico+2020+herencia PDF link annotation
    • http://hellochildren.online/872243186475fs8n.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/sariwuw.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/adverbs_of_time_exercise.pdfIn PDF document text
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/basotokewu.pdfIn PDF document text
    • https://lajexupizad.weebly.com/uploads/1/3/0/7/130775806/0cf35e2a9838.pdfIn PDF document text
    • http://caterm.ru/liwagimanadabekekivuvuwujd5ghv.pdfIn PDF document text
    • http://vemelaribox.getenjoyment.net/75018603608.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/475fffea5124.pdfIn PDF document text
    • http://betmoy56.com/feasibility_analysis_matrix_templatep5g1f.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/5566017.pdfIn PDF document text
    • https://detimuveruriwus.weebly.com/uploads/1/3/1/8/131872178/wosuzokimusuzez-loxis-mixitejumepifo-bubavipoxumova.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/beethoven_moonlight_sonata_guitar_tab.pdfIn PDF document text
    • https://pameduvexeligim.weebly.com/uploads/1/3/4/5/134579292/legizunowimataxo.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/xejozepotewunuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_d91cd4ee06974d44b618ee420c6017ce.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_ec8a8509dbf346e7bd8b991e44782e42.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_f944b7ee55ee4c95af00a29d55e8b3bb.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_2e09f51557f8484f89f4b24d36fee17c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 5596 bytes
SHA-256: f1903c70dc71a49a72ce297dd0f7da42f7f5763fcf524fc38be77af1bf1bcf35
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 12076 bytes
SHA-256: a6909d6205e612314630c89caf8cc210670d3c5012643d70d5c2d432edf05d02

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