Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9a0e9c6ae1c3db…

MALICIOUS

PDF

74.8 KB Created: 2021-05-21 11:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3b83761d89d92aba3f2690e757c91e73 SHA-1: 28300523f4e3e2b0fae21a9a2a775815f98ab227 SHA-256: ad9a0e9c6ae1c3dbfe35d91578b1fbfe48e8018d70d5e05f0e73b50f7fce81f0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=diagnosis+intrahepatic+cholestasis+of+pregnancy PDF link annotation
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/58a5ff2e204.pdfIn PDF document text
    • https://kazamudadi.weebly.com/uploads/1/3/0/7/130775411/13bc6245edb113.pdfIn PDF document text
    • https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/0dd3d15ea36e.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/zuwosil/fifiditajawifu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/ballay_ballay_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/acid_rain_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/uppababy_vista_2018_pram_with_bassinet_black_graphite.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/nadobigekekoxeredavodozuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/25488718509.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/pamafojogemi.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/41429501247.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/ambari_kannada_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/black_twitter_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/38920189314.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/muscle_after_40_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/nusuwofosabezavadif.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/60453323541.pdfIn PDF document text
    • https://medlineplus.gov/genetics/condition/intrahepatic-cholestasis-of-pregnancyIn 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_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 5380 bytes
SHA-256: 490c404ec01e5577e7d01b267d6ec246c877d0d0fc06fab5b500354efe67efec
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10732 bytes
SHA-256: a770f2c409dbeef578916e017914fd5b1ccf95f2bd332575d97d17a7fee50b1c

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