Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b952d9843239e3…

MALICIOUS

PDF

80.8 KB Created: 2021-05-26 06:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 645d7dea29aaa0c22a6e46901d53f361 SHA-1: 6ee507cd0d82b71a49b089a66e8833393e68bb9b SHA-256: 32b952d9843239e33a64bc82f9874ce9d8c1b71906cb976adb65ea66a6aee023
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to boost search engine rankings or distribute malware. The primary URL, https://nipisod.ru/strik?utm_term=yowhatsapp+apk+download+latest+version+7.60, suggests a lure for downloading software, likely a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=yowhatsapp+apk+download+latest+version+7.60 PDF link annotation
    • https://vesovagesigopek.weebly.com/uploads/1/3/4/6/134614223/tofodaxiwubone.pdfIn PDF document text
    • https://raxasowofano.weebly.com/uploads/1/3/2/6/132681821/remimejeb.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/7116441.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/4bbab.pdfIn PDF document text
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/75058744b9d7.pdfIn PDF document text
    • https://zagusopiv.weebly.com/uploads/1/3/4/2/134234894/8000438.pdfIn PDF document text
    • https://nozoxajomakod.weebly.com/uploads/1/3/5/3/135332829/nalun.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/monalasopi.pdfIn PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/5700509.pdfIn PDF document text
    • https://tajizaruf.weebly.com/uploads/1/3/0/8/130813694/9210988.pdfIn PDF document text
    • https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/a29bf5f60f1.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/satulibaren/18383807260.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/autocad_autolisp_developer_s_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc62e688-959b-4f50-877c-74cc509175ca/why_wont_my_water_softener_stop_running.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/spongebob_ight_imma_head_out_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4406feb8-a515-4017-a3e9-b4d89e40ee94/33538673724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690169ef-0130-4f92-987f-ab45054de49a/lipibitedadokuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/821232aa-ce85-4323-9f69-7ea84b19f3aa/how_to_calculate_joint_probability_distribution_table.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/the_chronicles_of_narnia_the_last_battle_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483aca7a-57cc-4a69-abf6-651cadeee176/lufezubolapogeremale.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/breast_cancer_screening_guidelines_2017.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_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 5632 bytes
SHA-256: 2be60e5557e145b0ba325ea10d818c22af52ff64ecff3db8ccb6ba35491d55c6
font_01_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 11328 bytes
SHA-256: d87d4fd83ea7dec530967c2bd5a37e8704541c43e3dc3ca45cfab61c6f9ea7c0

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