Malicious PDF — malware analysis report

Static analysis result for SHA-256 c216d671aeb743a2…

MALICIOUS

PDF

84.4 KB Created: 2021-03-23 04:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7ec85da4338b08d70bf8b7a7660d5411 SHA-1: d5ee045bc59dde49e78552e4677e9dc4e87d73aa SHA-256: c216d671aeb743a2caeeca096a27a0311a4312f7275aeea8100620b3f219c16c
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, with one specifically identified as a redirector for 'free-download phishing'. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://golowaki.ru/123?utm_term=bride+and+groom+poses+pdf PDF link annotation
    • https://nawowelefet.weebly.com/uploads/1/3/4/4/134498780/4286808.pdfIn PDF document text
    • http://shoppermarket.online/billion_dollar_whale_malaysiarnteh.pdfIn PDF document text
    • http://pekibimige.mygamesonline.org/advantages_and_disadvantages_of_ambush_marketing.pdfIn PDF document text
    • http://wikotimu.scienceontheweb.net/how_do_i_take_a_screenshot_on_windows_7_with_keyboard.pdfIn PDF document text
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/766b687.pdfIn PDF document text
    • http://normal-id.com/515127784311swlz.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/kavewujuo9m6j.pdfIn PDF document text
    • http://instofficial.online/75722908823v0q20.pdfIn PDF document text
    • http://the-glow.ru/9060577470225tw1.pdfIn PDF document text
    • https://mekadademuru.weebly.com/uploads/1/3/4/3/134367219/5cd7a172c30f.pdfIn PDF document text
    • https://zilasemewoxuj.weebly.com/uploads/1/3/4/3/134318224/7846615.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/laginekux/mp4_hd_action_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/43404059036.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/45434325143.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/fasavasidabijowobuzizakab.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/checkpoint_capsule_vpn_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/verbos_regulares_en_ingles_past_simple_y_past_participle.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/pokisurorijoluzavo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 5380 bytes
SHA-256: 0badb74c0c55334ec0c946456c40011b5d313f59cd3ad216fda3e07a8a77fc6a
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 13780 bytes
SHA-256: ce2f774af514348a87188de62ef06f5a03ac930fc4daa61d559715e7c652ae91
font_02_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd