Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9439d77a9e84836…

MALICIOUS

PDF

130.4 KB Created: 2021-03-19 13:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ced4a8ded5dc0e720d2eb808e1795fcc SHA-1: 66d96c45a974b3bc830fe0a99153de3586a2b9f0 SHA-256: f9439d77a9e84836d90dead09b38998b523bb75391aa255168276d5d45e2664a
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, directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/strik?utm_term=sri+vishnu+sahasranamam+lyrics+in+hindi PDF link annotation
    • http://affilateapp.online/l_amant_de_la_chine_du_nordegays.pdfIn PDF document text
    • http://limaxinsto.xyz/42254681365in5qy.pdfIn PDF document text
    • https://bojojibapofaz.weebly.com/uploads/1/3/4/4/134478515/2566796.pdfIn PDF document text
    • http://dompodklyuch.com/wumefefit2aqgs.pdfIn PDF document text
    • http://belkwigs.com/hp_officejet_pro_l7680_repair_manualutbde.pdfIn PDF document text
    • http://alerma.ru/free_printable_emergency_contact_form_for_babysitter3gfks.pdfIn PDF document text
    • http://babitilakibo.mywebcommunity.org/moxafovesotovafedofibel.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/9766295.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/80793510620.pdfIn PDF document text
    • http://kodavuviguwu.mypressonline.com/story_elements_worksheets_8th_grade.pdfIn PDF document text
    • http://jusapp.club/do_mcdonalds_employees_get_discounts_on_apple_productsgifrz.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/dd_d20_dice_box.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/kulidukadokivobodutid.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/rounding_decimals_worksheet_5th_grade_printable.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_6b40fce20efa4674af8bbae80cd3e9f7.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_f32529aefaff4c66a067fce0f0b8f65e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legipalofi/final_fight_arcade_apk.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_ffb06face7ea48d6bafe81a3ea83239f.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_62fe465c84254b42bc4a9733413a1ac8.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_42fa4eaff22b4c4ea08c4353622658d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezutu/dr_seuss_coloring_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/mixed_fraction_addition_worksheet.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a915.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A915 28516 bytes
SHA-256: 5db5747639fb9123b2f3057ec2f29354a2109e3442208a46da1930ca4e75a711
font_00_sfnt_off00016991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16991 5444 bytes
SHA-256: 19e9005f1994d15cd910c0cb81beb40f5420f00c687ddf25be045a3970167116
font_01_sfnt_off00017bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BED 3772 bytes
SHA-256: 4cd60777e265fafd80a6c4ac8a8f541642313e2b1c6670a3899fdf55b12f51bc
font_02_sfnt_off00018791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18791 9772 bytes
SHA-256: 37d4d4dfb5416552790b5e35675160ac9b9ee3a2dd0c2b966495b46d08ffab17