Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe87e831166129d…

MALICIOUS

PDF

86.7 KB Created: 2021-03-20 22:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b4f767731955f6251e74252bac8b2b06 SHA-1: b58f4e2216b13e2fb0fe0680fbbe79a5ff168911 SHA-256: 5fe87e831166129d59ce7428b7a6d8b0b9a11a4067c2e559152edf78505e1602
156 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 of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The primary URL, https://ponafet.ru/award?keyword=weight+gain+diet+plan+pdf+download, indicates a lure for users searching for diet plans. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/award?keyword=weight+gain+diet+plan+pdf+download PDF link annotation
    • http://kirakexig.mypressonline.com/broken_vessels_chord_chart.pdfIn PDF document text
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/3b8594d13e15114.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/osprey_publishing_artwork.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/simple_english_sentences_with_tamil_meaning.pdfIn PDF document text
    • https://poxofosu.weebly.com/uploads/1/3/4/3/134308827/925003.pdfIn PDF document text
    • https://bagamijak.weebly.com/uploads/1/3/1/3/131380043/fuvivobog.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/install_hs200_without_neutral.pdfIn PDF document text
    • https://lefukumot.weebly.com/uploads/1/3/4/8/134887275/dowivugejadad-wabigogo.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/what_is_bitcoin_mining_in_simple_terms.pdfIn PDF document text
    • https://burodepizojeke.weebly.com/uploads/1/3/2/6/132696233/fedujejejob.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/japodanejesovezuwotonuk.pdfIn PDF document text
    • https://wotixefutakit.weebly.com/uploads/1/3/2/8/132815753/43191.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/f277914969820.pdfIn PDF document text
    • https://jopakawinotu.weebly.com/uploads/1/3/1/4/131407654/rigapozoxolovepobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xoxaneral/79687802435.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/savijisebenibibakagutujid.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/6648905735.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/horton_hears_a_who_full_movie_in_hindi_dubbed_watch_online.pdfIn PDF document text
    • http://nevabaza.atwebpages.com/wovibulibokevasekuvano.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/99744458800.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/jizupepipojem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8769b346-9e38-4cd5-8632-092a4742c9bb/free_architectural_drawing_apps_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/linear_guide_roller_bearing_sliding_rail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60934f0a-65fb-42a3-b2b7-23551d6314d1/dell_precision_m6800_windows_10_driver_pack.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 4924 bytes
SHA-256: a047496ad2dfa6f948d8314363401453f3f82d8b446a033dd96073985a312fe0
font_01_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 11108 bytes
SHA-256: 73aaee817de59ffa7779c6e52c15a91dfe8053167db9288a50ac5c439a003280
font_02_sfnt_off00013f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F17 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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