Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f910822266c55e4…

MALICIOUS

PDF

77.6 KB Created: 2021-05-20 12:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b7a40d18d541ecedffd3a682b66f3bc7 SHA-1: b2536fe8fce158ae67dcb8391572fe223aea37e9 SHA-256: 4f910822266c55e4961d03753fb6d2d76858acc9557bbbb54bd6b3d691a37532
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=how+to+install+ceiling+fan+remote+control+kit PDF link annotation
    • https://lufegema.weebly.com/uploads/1/3/4/1/134132410/wojamutikelez_jigaxad.pdfIn PDF document text
    • https://jetujonupukoj.weebly.com/uploads/1/3/1/1/131163664/lisodulemoge-runijawimakag-lolazelujixuriw-xizise.pdfIn PDF document text
    • https://kaxaratit.weebly.com/uploads/1/3/5/3/135383379/35bb4d6fd3ee1e6.pdfIn PDF document text
    • https://logomuwijo.weebly.com/uploads/1/3/0/7/130738525/vovatebipus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_60385f85c0d90.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/nidojiga.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/zajujob.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/33efe3462410c.pdfIn PDF document text
    • https://joxuripuziw.weebly.com/uploads/1/3/4/2/134266010/kekavilub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_60335933d0af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_6066f8974d57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_6036f23512e3b.pdfIn PDF document text
    • https://zunifoxorim.weebly.com/uploads/1/3/4/3/134320692/vawamebevekegof_xukiwewi_fizajal_wawodopugafel.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/gazijewevan/how_to_rappel_off_a_tree.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/38880624804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8802adbf-54a5-439e-88b3-c419054f483d/the_intention_experiment_lynne_mctaggart.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/namonugubaseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3e4787-4e15-438a-b489-904a75f5fa9b/analyzing_graphs_of_functions_and_relations_1-2.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/10601562756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58093d98-0b99-4081-8f51-55f2c287097e/twilight_breaking_dawn_part_2_renesmee_and_bella.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/katabebomanedabejajonafu.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/hotel_california_violin_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/brutal_doom_android_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/2013_kawasaki_brute_force_750_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/90520961285.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_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 5320 bytes
SHA-256: a99ec3934a856e37ed0964315e7730787f86b07b06f0bf282c74dd0673e12be9
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 11508 bytes
SHA-256: 7cae3a5a1b0550cb1870cd4dcb6765cc296a9ddfca11a5306be6f33a96adf20b