Malicious PDF — malware analysis report

Static analysis result for SHA-256 03544b54a148aced…

MALICIOUS

PDF

87.7 KB Created: 2021-06-08 18:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b02c47a0668c124806579ea5c25934cf SHA-1: cccc87993c3d581457c3f63414ce92747e211f07 SHA-256: 03544b54a148aced7372fa745bbe89f3292f2dfc46050235910b6fa6a0c32df4
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, suggesting a link farm designed to distribute malicious content. The presence of a URL with 'autocad+2010+with+crack+64+bit' in its query parameter indicates a lure for pirated software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/pbw?utm_term=autocad+2010+with+crack+64+bit PDF link annotation
    • https://jepalojut.weebly.com/uploads/1/3/4/8/134863082/wotofefusadomas-vadubepos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443804/normal_601ec7585b54b.pdfIn PDF document text
    • https://dijemafewume.weebly.com/uploads/1/3/5/9/135992897/janidonopi_jubuwisiwaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_6049f1902816a.pdfIn PDF document text
    • https://wiperorapaxomun.weebly.com/uploads/1/3/5/3/135323561/pikatemu.pdfIn PDF document text
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/9495948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_602288a180f8b.pdfIn PDF document text
    • https://mawatewif.weebly.com/uploads/1/3/0/9/130969671/vafikisuti_kalukomipaxije.pdfIn PDF document text
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/pusukepiran_xirixagi_wodariramo.pdfIn PDF document text
    • https://zuvimigiga.weebly.com/uploads/1/3/4/5/134586735/jujelukixubam.pdfIn PDF document text
    • https://bulogisovorave.weebly.com/uploads/1/3/4/5/134597537/aa64d44ac77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_600c789c6c014.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144595200/how_much_is_4_pounds_of_ginseng_worth.pdfIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144634995/vudetovo.pdfIn PDF document text
    • http://rajejor.pbworks.com/w/file/fetch/144866028/tutorial_rhino_5_italiano.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144463149/what_does_the_particle_to_mean_in_japanese.pdfIn PDF document text
    • http://tovemubu.pbworks.com/f/perrenoud_p._2004._diez_nuevas_competencias_para_ensear._sep-gra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f936dd-df0b-4360-93da-e4b855ef5b8f/how_to_get_a_custom_cape_in_minecraft_java.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/56520918947.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/f/serib.pdfIn PDF document text
    • http://dujimowiwup.pbworks.com/w/file/fetch/144826629/detached_tone_in_writing.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/idmss_plus_android_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/262080dd-dbab-4407-9d43-1986b2572341/if_you_share_a_video_in_a_private_message_on_facebook.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010cd9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10CD9 10680 bytes
SHA-256: 89d99842d5dca2db072f55fba06609013149586e49b2087c15313f7180edfd60
font_00_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 5668 bytes
SHA-256: efee72d1f3c009cd728ff9c662fda987db4f6c20eeb6985530ccbb59faa262f0
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 1852 bytes
SHA-256: ab7952e30a868751faa025f2e14b53a51e83c417853e71d0ae878d8a5e8faa15
font_03_sfnt_off00012ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE3 11340 bytes
SHA-256: 88d4278c3f06ef1c3bf1b576bfad534b5abf1247b0bceb778b94c0538f244a8d

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