Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa03f12b8a75349…

MALICIOUS

PDF

76.8 KB Created: 2021-06-07 06:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 80102ff546f6c1c9be15ede4f427435d SHA-1: 747da8427e245bf75a085ebbb39f11a26deb25a7 SHA-256: 1aa03f12b8a753491276c9f9ec8997ebf75db0061d445862e7e097648608bf2c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://pistant.ru/pbw?utm_term=emulador+de+android+para+pc+fraco+muito+bom+e+leve PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385863/normal_601f3d85149d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_603e7be6f0b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_600a00d590add.pdfIn PDF document text
    • https://ruwivogisi.weebly.com/uploads/1/3/4/2/134265822/negupelenizu.pdfIn PDF document text
    • https://luvikexixof.weebly.com/uploads/1/3/4/4/134481561/geten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455376/normal_603a08225ba0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_604b6fbd4a793.pdfIn PDF document text
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/ab90bb4a26736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_6053dd5208f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_60109ebf07539.pdfIn PDF document text
    • https://walutosewog.weebly.com/uploads/1/3/4/3/134312240/lagevam-venetu-loliselav-xodatul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480750/normal_5fe33beb5f9c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_60500a44dbdd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aef5b42-b342-426e-b51c-0cd9f5d5b5de/river_flows_in_you_yiruma_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c3e5e9-9663-4206-a379-8ee4773b0d06/kenmore_he2_dryer_start_button_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7331e847-421e-40fb-a732-477c61e533bb/brawl_stars_hack_apk_16._1767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b020d80-cbb8-4894-99a8-cc3b8860eeb5/love_story_1970_movie_download_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39c360d-b2f2-4a9f-9e0a-7555e3c965c9/wimpy_kid_cast.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_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 5280 bytes
SHA-256: bf5974c54cbc3460fde66ce663c376fb8eb8e3727832e02bcbfe7eba59b6f891
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 12416 bytes
SHA-256: ebc5cf44d62a74154a1bed2282797e148e0b6ac282956af7cfba2dee058dd6f3

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