Malicious PDF — malware analysis report

Static analysis result for SHA-256 772784c41727ee10…

MALICIOUS

PDF

83.6 KB Created: 2021-04-04 07:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78b6e9fe2930391af5d7f30c1ada9aac SHA-1: 5df9a84065f590d51263bbc1f1f95192eead7fdc SHA-256: 772784c41727ee10fd44252a4f5a614a03e055105cdf512a127037d76bcd2997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are to benign-looking PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fofonamid.weebly.com/uploads/1/3/4/8/134869219/dusajetekuluduw-vajar-wikum.pdf
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/1f49914e069ebd.pdf
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/4c35d26bb6.pdf
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/badaluse_zakiripexosev_zodenotesewe_xepoturijefo.pdf
    • http://neriwor.medianewsonline.com/vigantol_bayer.pdf
    • http://vegoletox.medianewsonline.com/54264993718.pdf
    • https://bojomuse.weebly.com/uploads/1/3/4/4/134462584/dumapuzisi_govugogozu_zunapulapez.pdf
    • http://sitizinudex.getenjoyment.net/math_worksheets_grade_1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Infin/~3/YW2AKwb2eCA/infin?utm_term=aditivos+e+coadjuvantes+alimentares+pdf
    • https://uploads.strikinglycdn.com/files/175a3039-43fa-4735-9dbe-779ed9433274/vizio_e550i-b2_no_remote.pdf
    • https://s3.amazonaws.com/lekizopiloref/emotional_sad_song_whatsapp_status.pdf
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_2b7b3760eea7451c813e49ddb0ecd93a.pdf?index=true
    • https://s3.amazonaws.com/luxaduzimase/bilixopozeka.pdf
    • http://fataragoreb.myartsonline.com/titrasi_argentometri_metode_mohr.pdf
    • https://s3.amazonaws.com/xilasisefi/what_wilton_tip_for_cupcakes.pdf
    • https://s3.amazonaws.com/najubu/army_amino_apk_free.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_d1c548c16f4a43eca0a3363fbde3de29.pdf?index=true
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_2ac51c07d3da445ca7d45dbe14f43ccb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bde84afa-f80d-4aa3-9310-f43a802f13dc/45077333156.pdf
    • https://uploads.strikinglycdn.com/files/4378f392-c652-442a-bedc-65a2a589b775/pufiwuwogeniru.pdf
    • https://s3.amazonaws.com/xulepiwa/97206031488.pdf
    • https://s3.amazonaws.com/nisoxow/yin_rk._case_study_research_design_and_methods.pdf
    • http://wojibikifi.myartsonline.com/storyboarder_for_ipad.pdf
    • https://s3.amazonaws.com/bokexizometun/bluedio_t2_plus_manual.pdf
    • https://uploads.strikinglycdn.com/files/35136c20-09b2-4fa0-9608-5641a30aa4fa/what_plague_killed_the_romans.pdf
    • https://s3.amazonaws.com/xoguwavosuje/auto_tune_7_free_with_crack.pdf
    • https://s3.amazonaws.com/sifawekujiki/metodologia_dela_investigacion_sampieri_resumen_por_capitulos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fabd.bin
26bdab3616484369529cfe36abf98983889b58b357513a3557bf78710b852ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 5424 bytes
font_01_sfnt_off00010d1f.bin
7a94dfa282ce0347053782d8b955d7618f774adb37c3bd5f03dce838a494a32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 1964 bytes
font_02_sfnt_off0001162c.bin
6d5aba572d2cea13a8b85834c3c10b72805f230b3f9a329e98bbcc1dc60ec72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 13276 bytes

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