Malicious PDF — malware analysis report

Static analysis result for SHA-256 6879500971686e5e…

MALICIOUS

PDF

80.7 KB Created: 2021-03-23 13:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9493aeda3962eeec9b70cbc07982946a SHA-1: c6403a7fcfbb96fd4d57e724331bc86860bb4077 SHA-256: 6879500971686e5e28a0cdef93df29de088b93e940875ccbfa2ac8c5d8dde7ae
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO-optimized domains designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a phishing or malware distribution campaign. The embedded URL 'https://resalured.ru/strik?utm_term=how+to+present+data+on+a+histogram' and the linked PDF 'http://irisca.online/chomage_canada_telephone_informationicl40.pdf' are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://resalured.ru/strik?utm_term=how+to+present+data+on+a+histogram PDF link annotation
    • http://irisca.online/chomage_canada_telephone_informationicl40.pdfIn PDF document text
    • https://lugigotaxur.weebly.com/uploads/1/3/0/9/130969655/wujarojevug-suxog-beloxuku.pdfIn PDF document text
    • https://retetozatinum.weebly.com/uploads/1/3/0/7/130775023/vagiremixuvak.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/5523164.pdfIn PDF document text
    • http://storeplus.pro/56411190417gt4cm.pdfIn PDF document text
    • http://fitokaps.xyz/19928803417k5f88.pdfIn PDF document text
    • https://loxufoxoxow.weebly.com/uploads/1/3/5/9/135982175/ff827a07a87.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/rovikibixu/bee_hives_images.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_4c1c14c7f4a544d4a8a44d6e9d4fc7f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagisi/beerappa_charitra_songs_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/writing_a_book_report.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_8653ff18aa604dd783b30305a3a50257.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_b5320156d54b499a8f4e57b28dd631dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/tutidawuneja.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/27921894510.pdfIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_ee1d23fa6be549abab71f2b046f6f1dd.pdf?index=trueIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_b611d4f284ce49abacae1fab5ff66d42.pdf?index=trueIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_4c0e08afdb844240993c8d8ee18bcf02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/maxibipovexodo.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/xukivenatixipenorabiruza.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_3109f4126b3c4effaac007e0a711a454.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavalukato/intensive_care_medicine_submission_guidelines.pdfIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_6ea4fe26e0114b2880391c6fdb924333.pdf?index=trueIn 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_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 5392 bytes
SHA-256: cc97c720b23d63784ffb387087561c50bedd26c85dd990721c6f034fef391934
font_01_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 12408 bytes
SHA-256: 2cc56333d1bf7f12e7a222b242f7f0413c6ecdc8f3a102c2f4ebf60fed6d12ce